diff --git a/.github/workflows/base-docker-publish.yml b/.github/workflows/base-docker-publish.yml
index e9028fe2..8765de7b 100644
--- a/.github/workflows/base-docker-publish.yml
+++ b/.github/workflows/base-docker-publish.yml
@@ -23,4 +23,4 @@ jobs:
       - name: Build & Push Image
         env:
           VERSION: ${{ inputs.version }}
-        run: docker build -t yorkieteam/codepair-poc:$VERSION --push ./backend
+        run: docker build -t yorkieteam/codepair:$VERSION --push ./backend
diff --git a/backend/.env b/backend/.env
index 405055c4..396a9adc 100644
--- a/backend/.env
+++ b/backend/.env
@@ -1,6 +1,14 @@
-DATABASE_URL="DATABASE_URL"
-GITHUB_CLIENT_ID="GITHUB_CLIENT_ID"
-GITHUB_CLIENT_SECRET="GITHUB_CLIENT_SECRET"
-GITHUB_CALLBACK_URL="<BACKEND_BASE_URL>/auth/login/github"
-JWT_AUTH_SECRET="JWT_AUTH_SECRET"
-FRONTEND_BASE_URL="FRONTEND_BASE_URL"
\ No newline at end of file
+DATABASE_URL=""
+GITHUB_CLIENT_ID=""
+GITHUB_CLIENT_SECRET=""
+GITHUB_CALLBACK_URL=""
+JWT_AUTH_SECRET=""
+FRONTEND_BASE_URL=""
+YORKIE_API_ADDR=""
+YORKIE_PROJECT_NAME=""
+YORKIE_PROJECT_SECRET_KEY=""
+OPENAI_API_KEY=""
+LANGCHAIN_TRACING_V2="true"
+LANGCHAIN_ENDPOINT="https://api.smith.langchain.com"
+LANGCHAIN_API_KEY=""
+LANGCHAIN_PROJECT=""
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 7c8b1184..2a52d449 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -9,6 +9,8 @@
 			"version": "0.0.1",
 			"license": "UNLICENSED",
 			"dependencies": {
+				"@langchain/community": "^0.0.21",
+				"@langchain/core": "^0.1.18",
 				"@nestjs/common": "^10.0.0",
 				"@nestjs/config": "^3.1.1",
 				"@nestjs/core": "^10.0.0",
@@ -20,6 +22,7 @@
 				"class-transformer": "^0.5.1",
 				"class-validator": "^0.14.1",
 				"markdown-to-txt": "^2.0.1",
+				"langchain": "^0.1.9",
 				"moment": "^2.30.1",
 				"passport-github": "^1.1.0",
 				"passport-jwt": "^4.0.1",
@@ -246,6 +249,30 @@
 				"node": ">=0.12.0"
 			}
 		},
+		"node_modules/@anthropic-ai/sdk": {
+			"version": "0.9.1",
+			"resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.9.1.tgz",
+			"integrity": "sha512-wa1meQ2WSfoY8Uor3EdrJq0jTiZJoKoSii2ZVWRY1oN4Tlr5s59pADg9T79FTbPe1/se5c3pBeZgJL63wmuoBA==",
+			"dependencies": {
+				"@types/node": "^18.11.18",
+				"@types/node-fetch": "^2.6.4",
+				"abort-controller": "^3.0.0",
+				"agentkeepalive": "^4.2.1",
+				"digest-fetch": "^1.3.0",
+				"form-data-encoder": "1.7.2",
+				"formdata-node": "^4.3.2",
+				"node-fetch": "^2.6.7",
+				"web-streams-polyfill": "^3.2.1"
+			}
+		},
+		"node_modules/@anthropic-ai/sdk/node_modules/@types/node": {
+			"version": "18.19.10",
+			"resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.10.tgz",
+			"integrity": "sha512-IZD8kAM02AW1HRDTPOlz3npFava678pr8Ie9Vp8uRhBROXAv8MXT2pCnGZZAKYdromsNQLHQcfWQ6EOatVLtqA==",
+			"dependencies": {
+				"undici-types": "~5.26.4"
+			}
+		},
 		"node_modules/@babel/code-frame": {
 			"version": "7.23.5",
 			"resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.23.5.tgz",
@@ -1664,6 +1691,408 @@
 				"@jridgewell/sourcemap-codec": "^1.4.14"
 			}
 		},
+		"node_modules/@langchain/community": {
+			"version": "0.0.21",
+			"resolved": "https://registry.npmjs.org/@langchain/community/-/community-0.0.21.tgz",
+			"integrity": "sha512-2b3azTwY3i4hKeNpxXhZ34h9CQHvPu1kNTxAT8mSuOwkA0ZZ+DQ1niOT0Ai1K0ZrSyice5aivgvy6v7Jf0yFZw==",
+			"dependencies": {
+				"@langchain/core": "~0.1.16",
+				"@langchain/openai": "~0.0.10",
+				"flat": "^5.0.2",
+				"langsmith": "~0.0.48",
+				"uuid": "^9.0.0",
+				"zod": "^3.22.3"
+			},
+			"engines": {
+				"node": ">=18"
+			},
+			"peerDependencies": {
+				"@aws-crypto/sha256-js": "^5.0.0",
+				"@aws-sdk/client-bedrock-agent-runtime": "^3.485.0",
+				"@aws-sdk/client-bedrock-runtime": "^3.422.0",
+				"@aws-sdk/client-dynamodb": "^3.310.0",
+				"@aws-sdk/client-kendra": "^3.352.0",
+				"@aws-sdk/client-lambda": "^3.310.0",
+				"@aws-sdk/client-sagemaker-runtime": "^3.310.0",
+				"@aws-sdk/client-sfn": "^3.310.0",
+				"@aws-sdk/credential-provider-node": "^3.388.0",
+				"@azure/search-documents": "^12.0.0",
+				"@clickhouse/client": "^0.2.5",
+				"@cloudflare/ai": "^1.0.12",
+				"@datastax/astra-db-ts": "^0.1.4",
+				"@elastic/elasticsearch": "^8.4.0",
+				"@getmetal/metal-sdk": "*",
+				"@getzep/zep-js": "^0.9.0",
+				"@gomomento/sdk": "^1.51.1",
+				"@gomomento/sdk-core": "^1.51.1",
+				"@google-ai/generativelanguage": "^0.2.1",
+				"@gradientai/nodejs-sdk": "^1.2.0",
+				"@huggingface/inference": "^2.6.4",
+				"@mozilla/readability": "*",
+				"@opensearch-project/opensearch": "*",
+				"@pinecone-database/pinecone": "^1.1.0",
+				"@planetscale/database": "^1.8.0",
+				"@qdrant/js-client-rest": "^1.2.0",
+				"@raycast/api": "^1.55.2",
+				"@rockset/client": "^0.9.1",
+				"@smithy/eventstream-codec": "^2.0.5",
+				"@smithy/protocol-http": "^3.0.6",
+				"@smithy/signature-v4": "^2.0.10",
+				"@smithy/util-utf8": "^2.0.0",
+				"@supabase/postgrest-js": "^1.1.1",
+				"@supabase/supabase-js": "^2.10.0",
+				"@tensorflow-models/universal-sentence-encoder": "*",
+				"@tensorflow/tfjs-converter": "*",
+				"@tensorflow/tfjs-core": "*",
+				"@upstash/redis": "^1.20.6",
+				"@vercel/kv": "^0.2.3",
+				"@vercel/postgres": "^0.5.0",
+				"@writerai/writer-sdk": "^0.40.2",
+				"@xata.io/client": "^0.28.0",
+				"@xenova/transformers": "^2.5.4",
+				"@zilliz/milvus2-sdk-node": ">=2.2.7",
+				"cassandra-driver": "^4.7.2",
+				"chromadb": "*",
+				"closevector-common": "0.1.0-alpha.1",
+				"closevector-node": "0.1.0-alpha.10",
+				"closevector-web": "0.1.0-alpha.16",
+				"cohere-ai": ">=6.0.0",
+				"convex": "^1.3.1",
+				"discord.js": "^14.14.1",
+				"faiss-node": "^0.5.1",
+				"firebase-admin": "^11.9.0",
+				"google-auth-library": "^8.9.0",
+				"googleapis": "^126.0.1",
+				"hnswlib-node": "^1.4.2",
+				"html-to-text": "^9.0.5",
+				"ioredis": "^5.3.2",
+				"jsdom": "*",
+				"llmonitor": "^0.5.9",
+				"lodash": "^4.17.21",
+				"lunary": "^0.6.11",
+				"mongodb": "^5.2.0",
+				"mysql2": "^3.3.3",
+				"neo4j-driver": "*",
+				"node-llama-cpp": "*",
+				"pg": "^8.11.0",
+				"pg-copy-streams": "^6.0.5",
+				"pickleparser": "^0.2.1",
+				"portkey-ai": "^0.1.11",
+				"redis": "^4.6.4",
+				"replicate": "^0.18.0",
+				"typeorm": "^0.3.12",
+				"typesense": "^1.5.3",
+				"usearch": "^1.1.1",
+				"vectordb": "^0.1.4",
+				"voy-search": "0.6.2",
+				"weaviate-ts-client": "^1.4.0",
+				"web-auth-library": "^1.0.3",
+				"ws": "^8.14.2"
+			},
+			"peerDependenciesMeta": {
+				"@aws-crypto/sha256-js": {
+					"optional": true
+				},
+				"@aws-sdk/client-bedrock-agent-runtime": {
+					"optional": true
+				},
+				"@aws-sdk/client-bedrock-runtime": {
+					"optional": true
+				},
+				"@aws-sdk/client-dynamodb": {
+					"optional": true
+				},
+				"@aws-sdk/client-kendra": {
+					"optional": true
+				},
+				"@aws-sdk/client-lambda": {
+					"optional": true
+				},
+				"@aws-sdk/client-sagemaker-runtime": {
+					"optional": true
+				},
+				"@aws-sdk/client-sfn": {
+					"optional": true
+				},
+				"@aws-sdk/credential-provider-node": {
+					"optional": true
+				},
+				"@azure/search-documents": {
+					"optional": true
+				},
+				"@clickhouse/client": {
+					"optional": true
+				},
+				"@cloudflare/ai": {
+					"optional": true
+				},
+				"@datastax/astra-db-ts": {
+					"optional": true
+				},
+				"@elastic/elasticsearch": {
+					"optional": true
+				},
+				"@getmetal/metal-sdk": {
+					"optional": true
+				},
+				"@getzep/zep-js": {
+					"optional": true
+				},
+				"@gomomento/sdk": {
+					"optional": true
+				},
+				"@gomomento/sdk-core": {
+					"optional": true
+				},
+				"@google-ai/generativelanguage": {
+					"optional": true
+				},
+				"@gradientai/nodejs-sdk": {
+					"optional": true
+				},
+				"@huggingface/inference": {
+					"optional": true
+				},
+				"@mozilla/readability": {
+					"optional": true
+				},
+				"@opensearch-project/opensearch": {
+					"optional": true
+				},
+				"@pinecone-database/pinecone": {
+					"optional": true
+				},
+				"@planetscale/database": {
+					"optional": true
+				},
+				"@qdrant/js-client-rest": {
+					"optional": true
+				},
+				"@raycast/api": {
+					"optional": true
+				},
+				"@rockset/client": {
+					"optional": true
+				},
+				"@smithy/eventstream-codec": {
+					"optional": true
+				},
+				"@smithy/protocol-http": {
+					"optional": true
+				},
+				"@smithy/signature-v4": {
+					"optional": true
+				},
+				"@smithy/util-utf8": {
+					"optional": true
+				},
+				"@supabase/postgrest-js": {
+					"optional": true
+				},
+				"@supabase/supabase-js": {
+					"optional": true
+				},
+				"@tensorflow-models/universal-sentence-encoder": {
+					"optional": true
+				},
+				"@tensorflow/tfjs-converter": {
+					"optional": true
+				},
+				"@tensorflow/tfjs-core": {
+					"optional": true
+				},
+				"@upstash/redis": {
+					"optional": true
+				},
+				"@vercel/kv": {
+					"optional": true
+				},
+				"@vercel/postgres": {
+					"optional": true
+				},
+				"@writerai/writer-sdk": {
+					"optional": true
+				},
+				"@xata.io/client": {
+					"optional": true
+				},
+				"@xenova/transformers": {
+					"optional": true
+				},
+				"@zilliz/milvus2-sdk-node": {
+					"optional": true
+				},
+				"cassandra-driver": {
+					"optional": true
+				},
+				"chromadb": {
+					"optional": true
+				},
+				"closevector-common": {
+					"optional": true
+				},
+				"closevector-node": {
+					"optional": true
+				},
+				"closevector-web": {
+					"optional": true
+				},
+				"cohere-ai": {
+					"optional": true
+				},
+				"convex": {
+					"optional": true
+				},
+				"discord.js": {
+					"optional": true
+				},
+				"faiss-node": {
+					"optional": true
+				},
+				"firebase-admin": {
+					"optional": true
+				},
+				"google-auth-library": {
+					"optional": true
+				},
+				"googleapis": {
+					"optional": true
+				},
+				"hnswlib-node": {
+					"optional": true
+				},
+				"html-to-text": {
+					"optional": true
+				},
+				"ioredis": {
+					"optional": true
+				},
+				"jsdom": {
+					"optional": true
+				},
+				"llmonitor": {
+					"optional": true
+				},
+				"lodash": {
+					"optional": true
+				},
+				"lunary": {
+					"optional": true
+				},
+				"mongodb": {
+					"optional": true
+				},
+				"mysql2": {
+					"optional": true
+				},
+				"neo4j-driver": {
+					"optional": true
+				},
+				"node-llama-cpp": {
+					"optional": true
+				},
+				"pg": {
+					"optional": true
+				},
+				"pg-copy-streams": {
+					"optional": true
+				},
+				"pickleparser": {
+					"optional": true
+				},
+				"portkey-ai": {
+					"optional": true
+				},
+				"redis": {
+					"optional": true
+				},
+				"replicate": {
+					"optional": true
+				},
+				"typeorm": {
+					"optional": true
+				},
+				"typesense": {
+					"optional": true
+				},
+				"usearch": {
+					"optional": true
+				},
+				"vectordb": {
+					"optional": true
+				},
+				"voy-search": {
+					"optional": true
+				},
+				"weaviate-ts-client": {
+					"optional": true
+				},
+				"web-auth-library": {
+					"optional": true
+				},
+				"ws": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/@langchain/core": {
+			"version": "0.1.18",
+			"resolved": "https://registry.npmjs.org/@langchain/core/-/core-0.1.18.tgz",
+			"integrity": "sha512-fDjocs899HDq3nf3PE0TveQoVabO0vyedt9i74Yef4Ds2o22TEDSh3MfoMxM8stcHiV3/9i+0wH4Xdm0E2YLdg==",
+			"dependencies": {
+				"ansi-styles": "^5.0.0",
+				"camelcase": "6",
+				"decamelize": "1.2.0",
+				"js-tiktoken": "^1.0.8",
+				"langsmith": "~0.0.48",
+				"ml-distance": "^4.0.0",
+				"p-queue": "^6.6.2",
+				"p-retry": "4",
+				"uuid": "^9.0.0",
+				"zod": "^3.22.4",
+				"zod-to-json-schema": "^3.22.3"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"node_modules/@langchain/core/node_modules/ansi-styles": {
+			"version": "5.2.0",
+			"resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+			"integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/chalk/ansi-styles?sponsor=1"
+			}
+		},
+		"node_modules/@langchain/core/node_modules/camelcase": {
+			"version": "6.3.0",
+			"resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.3.0.tgz",
+			"integrity": "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==",
+			"engines": {
+				"node": ">=10"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
+		"node_modules/@langchain/openai": {
+			"version": "0.0.13",
+			"resolved": "https://registry.npmjs.org/@langchain/openai/-/openai-0.0.13.tgz",
+			"integrity": "sha512-kgPwFiUA5Abmt8Q/cDhC4o1o5QAYuq962CqneVieMIgTUOJhYqB8Na4/7JI0EIfEZuUP2uuTrtqsulbLpGNQ8w==",
+			"dependencies": {
+				"@langchain/core": "~0.1.13",
+				"js-tiktoken": "^1.0.7",
+				"openai": "^4.26.0",
+				"zod": "^3.22.4",
+				"zod-to-json-schema": "^3.22.3"
+			},
+			"engines": {
+				"node": ">=18"
+			}
+		},
 		"node_modules/@ljharb/through": {
 			"version": "2.3.11",
 			"resolved": "https://registry.npmjs.org/@ljharb/through/-/through-2.3.11.tgz",
@@ -2329,6 +2758,15 @@
 				"undici-types": "~5.26.4"
 			}
 		},
+		"node_modules/@types/node-fetch": {
+			"version": "2.6.11",
+			"resolved": "https://registry.npmjs.org/@types/node-fetch/-/node-fetch-2.6.11.tgz",
+			"integrity": "sha512-24xFj9R5+rfQJLRyM56qh+wnVSYhyXC2tkoBndtY0U+vubqNsYXGjufB2nn8Q6gt0LrARwL6UBtMCSVCwl4B1g==",
+			"dependencies": {
+				"@types/node": "*",
+				"form-data": "^4.0.0"
+			}
+		},
 		"node_modules/@types/qs": {
 			"version": "6.9.11",
 			"resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.11.tgz",
@@ -2341,6 +2779,11 @@
 			"integrity": "sha512-hKormJbkJqzQGhziax5PItDUTMAM9uE2XXQmM37dyd4hVM+5aVl7oVxMVUiVQn2oCQFN/LKCZdvSM0pFRqbSmQ==",
 			"dev": true
 		},
+		"node_modules/@types/retry": {
+			"version": "0.12.0",
+			"resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
+			"integrity": "sha512-wWKOClTTiizcZhXnPY4wikVAwmdYHp8q6DmC+EJUzAMsycb7HB32Kh9RN4+0gExjmPmZSAQjgURXIGATPegAvA=="
+		},
 		"node_modules/@types/semver": {
 			"version": "7.5.6",
 			"resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.5.6.tgz",
@@ -2395,6 +2838,11 @@
 				"@types/superagent": "^8.1.0"
 			}
 		},
+		"node_modules/@types/uuid": {
+			"version": "9.0.8",
+			"resolved": "https://registry.npmjs.org/@types/uuid/-/uuid-9.0.8.tgz",
+			"integrity": "sha512-jg+97EGIcY9AGHJJRaaPVgetKDsrTgbRjQ5Msgjh/DQKEFl0DtyRr/VCOyD1T2R1MNeWPK/u7JoGhlDZnKBAfA=="
+		},
 		"node_modules/@types/validator": {
 			"version": "13.11.8",
 			"resolved": "https://registry.npmjs.org/@types/validator/-/validator-13.11.8.tgz",
@@ -2769,6 +3217,17 @@
 			"integrity": "sha512-NuHqBY1PB/D8xU6s/thBgOAiAP7HOYDQ32+BFZILJ8ivkUkAHQnWfn6WhL79Owj1qmUnoN/YPhktdIoucipkAQ==",
 			"dev": true
 		},
+		"node_modules/abort-controller": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
+			"integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
+			"dependencies": {
+				"event-target-shim": "^5.0.0"
+			},
+			"engines": {
+				"node": ">=6.5"
+			}
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+					"optional": true
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+					"optional": true
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+				"chromadb": {
+					"optional": true
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+					"optional": true
+				},
+				"faiss-node": {
+					"optional": true
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+				"fast-xml-parser": {
+					"optional": true
+				},
+				"google-auth-library": {
+					"optional": true
+				},
+				"googleapis": {
+					"optional": true
+				},
+				"handlebars": {
+					"optional": true
+				},
+				"html-to-text": {
+					"optional": true
+				},
+				"ignore": {
+					"optional": true
+				},
+				"ioredis": {
+					"optional": true
+				},
+				"jsdom": {
+					"optional": true
+				},
+				"mammoth": {
+					"optional": true
+				},
+				"mongodb": {
+					"optional": true
+				},
+				"node-llama-cpp": {
+					"optional": true
+				},
+				"notion-to-md": {
+					"optional": true
+				},
+				"officeparser": {
+					"optional": true
+				},
+				"pdf-parse": {
+					"optional": true
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+					"optional": true
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+				"playwright": {
+					"optional": true
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+				"puppeteer": {
+					"optional": true
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+					"optional": true
+				},
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+					"optional": true
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+					"optional": true
+				},
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+					"optional": true
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+				"typeorm": {
+					"optional": true
+				},
+				"vectordb": {
+					"optional": true
+				},
+				"weaviate-ts-client": {
+					"optional": true
+				},
+				"web-auth-library": {
+					"optional": true
+				},
+				"ws": {
+					"optional": true
+				},
+				"youtube-transcript": {
+					"optional": true
+				},
+				"youtubei.js": {
+					"optional": true
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+		"node_modules/langchainhub": {
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+			"resolved": "https://registry.npmjs.org/langchainhub/-/langchainhub-0.0.6.tgz",
+			"integrity": "sha512-SW6105T+YP1cTe0yMf//7kyshCgvCTyFBMTgH2H3s9rTAR4e+78DA/BBrUL/Mt4Q5eMWui7iGuAYb3pgGsdQ9w=="
+		},
+		"node_modules/langsmith": {
+			"version": "0.0.63",
+			"resolved": "https://registry.npmjs.org/langsmith/-/langsmith-0.0.63.tgz",
+			"integrity": "sha512-8KtbiltWP8Ta7xErfXRvLudKgIoc/yRb9oSU8Ozh2215rlz9tnYicl37lS/ZdyeSbpSX8Rh8XhLTN5zVQ+5euA==",
+			"dependencies": {
+				"@types/uuid": "^9.0.1",
+				"commander": "^10.0.1",
+				"p-queue": "^6.6.2",
+				"p-retry": "4",
+				"uuid": "^9.0.0"
+			},
+			"bin": {
+				"langsmith": "dist/cli/main.cjs"
+			}
+		},
+		"node_modules/langsmith/node_modules/commander": {
+			"version": "10.0.1",
+			"resolved": "https://registry.npmjs.org/commander/-/commander-10.0.1.tgz",
+			"integrity": "sha512-y4Mg2tXshplEbSGzx7amzPwKKOCGuoSRP/CjEdwwk0FOGlUbq6lKuoyDZTNZkmxHdJtp54hdfY/JUrdL7Xfdug==",
+			"engines": {
+				"node": ">=14"
+			}
+		},
 		"node_modules/leven": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/leven/-/leven-3.1.0.tgz",
@@ -6711,6 +7570,46 @@
 				"mkdirp": "bin/cmd.js"
 			}
 		},
+		"node_modules/ml-array-mean": {
+			"version": "1.1.6",
+			"resolved": "https://registry.npmjs.org/ml-array-mean/-/ml-array-mean-1.1.6.tgz",
+			"integrity": "sha512-MIdf7Zc8HznwIisyiJGRH9tRigg3Yf4FldW8DxKxpCCv/g5CafTw0RRu51nojVEOXuCQC7DRVVu5c7XXO/5joQ==",
+			"dependencies": {
+				"ml-array-sum": "^1.1.6"
+			}
+		},
+		"node_modules/ml-array-sum": {
+			"version": "1.1.6",
+			"resolved": "https://registry.npmjs.org/ml-array-sum/-/ml-array-sum-1.1.6.tgz",
+			"integrity": "sha512-29mAh2GwH7ZmiRnup4UyibQZB9+ZLyMShvt4cH4eTK+cL2oEMIZFnSyB3SS8MlsTh6q/w/yh48KmqLxmovN4Dw==",
+			"dependencies": {
+				"is-any-array": "^2.0.0"
+			}
+		},
+		"node_modules/ml-distance": {
+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/ml-distance/-/ml-distance-4.0.1.tgz",
+			"integrity": "sha512-feZ5ziXs01zhyFUUUeZV5hwc0f5JW0Sh0ckU1koZe/wdVkJdGxcP06KNQuF0WBTj8FttQUzcvQcpcrOp/XrlEw==",
+			"dependencies": {
+				"ml-array-mean": "^1.1.6",
+				"ml-distance-euclidean": "^2.0.0",
+				"ml-tree-similarity": "^1.0.0"
+			}
+		},
+		"node_modules/ml-distance-euclidean": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/ml-distance-euclidean/-/ml-distance-euclidean-2.0.0.tgz",
+			"integrity": "sha512-yC9/2o8QF0A3m/0IXqCTXCzz2pNEzvmcE/9HFKOZGnTjatvBbsn4lWYJkxENkA4Ug2fnYl7PXQxnPi21sgMy/Q=="
+		},
+		"node_modules/ml-tree-similarity": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/ml-tree-similarity/-/ml-tree-similarity-1.0.0.tgz",
+			"integrity": "sha512-XJUyYqjSuUQkNQHMscr6tcjldsOoAekxADTplt40QKfwW6nd++1wHWV9AArl0Zvw/TIHgNaZZNvr8QGvE8wLRg==",
+			"dependencies": {
+				"binary-search": "^1.3.5",
+				"num-sort": "^2.0.0"
+			}
+		},
 		"node_modules/moment": {
 			"version": "2.30.1",
 			"resolved": "https://registry.npmjs.org/moment/-/moment-2.30.1.tgz",
@@ -6773,6 +7672,24 @@
 			"integrity": "sha512-AGK2yQKIjRuqnc6VkX2Xj5d+QW8xZ87pa1UK6yA6ouUyuxfHuMP6umE5QK7UmTeOAymo+Zx1Fxiuw9rVx8taHQ==",
 			"dev": true
 		},
+		"node_modules/node-domexception": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+			"integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/jimmywarting"
+				},
+				{
+					"type": "github",
+					"url": "https://paypal.me/jimmywarting"
+				}
+			],
+			"engines": {
+				"node": ">=10.5.0"
+			}
+		},
 		"node_modules/node-emoji": {
 			"version": "1.11.0",
 			"resolved": "https://registry.npmjs.org/node-emoji/-/node-emoji-1.11.0.tgz",
@@ -6834,6 +7751,17 @@
 				"node": ">=8"
 			}
 		},
+		"node_modules/num-sort": {
+			"version": "2.1.0",
+			"resolved": "https://registry.npmjs.org/num-sort/-/num-sort-2.1.0.tgz",
+			"integrity": "sha512-1MQz1Ed8z2yckoBeSfkQHHO9K1yDRxxtotKSJ9yvcTUUxSvfvzEq5GwBrjjHEpMlq/k5gvXdmJ1SbYxWtpNoVg==",
+			"engines": {
+				"node": ">=8"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
 		"node_modules/oauth": {
 			"version": "0.9.15",
 			"resolved": "https://registry.npmjs.org/oauth/-/oauth-0.9.15.tgz",
@@ -6890,6 +7818,38 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/openai": {
+			"version": "4.26.0",
+			"resolved": "https://registry.npmjs.org/openai/-/openai-4.26.0.tgz",
+			"integrity": "sha512-HPC7tgYdeP38F3uHA5WgnoXZyGbAp9jgcIo23p6It+q/07u4C+NZ8xHKlMShsPbDDmFRpPsa3vdbXYpbhJH3eg==",
+			"dependencies": {
+				"@types/node": "^18.11.18",
+				"@types/node-fetch": "^2.6.4",
+				"abort-controller": "^3.0.0",
+				"agentkeepalive": "^4.2.1",
+				"digest-fetch": "^1.3.0",
+				"form-data-encoder": "1.7.2",
+				"formdata-node": "^4.3.2",
+				"node-fetch": "^2.6.7",
+				"web-streams-polyfill": "^3.2.1"
+			},
+			"bin": {
+				"openai": "bin/cli"
+			}
+		},
+		"node_modules/openai/node_modules/@types/node": {
+			"version": "18.19.10",
+			"resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.10.tgz",
+			"integrity": "sha512-IZD8kAM02AW1HRDTPOlz3npFava678pr8Ie9Vp8uRhBROXAv8MXT2pCnGZZAKYdromsNQLHQcfWQ6EOatVLtqA==",
+			"dependencies": {
+				"undici-types": "~5.26.4"
+			}
+		},
+		"node_modules/openapi-types": {
+			"version": "12.1.3",
+			"resolved": "https://registry.npmjs.org/openapi-types/-/openapi-types-12.1.3.tgz",
+			"integrity": "sha512-N4YtSYJqghVu4iek2ZUvcN/0aqH1kRDuNqzcycDxhOUpg7GdvLa2F3DgS6yBNhInhv2r/6I0Flkn7CqL8+nIcw=="
+		},
 		"node_modules/optionator": {
 			"version": "0.9.3",
 			"resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.3.tgz",
@@ -6939,6 +7899,14 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/p-finally": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
+			"integrity": "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow==",
+			"engines": {
+				"node": ">=4"
+			}
+		},
 		"node_modules/p-limit": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
@@ -6969,6 +7937,44 @@
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
 		},
+		"node_modules/p-queue": {
+			"version": "6.6.2",
+			"resolved": "https://registry.npmjs.org/p-queue/-/p-queue-6.6.2.tgz",
+			"integrity": "sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==",
+			"dependencies": {
+				"eventemitter3": "^4.0.4",
+				"p-timeout": "^3.2.0"
+			},
+			"engines": {
+				"node": ">=8"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/sindresorhus"
+			}
+		},
+		"node_modules/p-retry": {
+			"version": "4.6.2",
+			"resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
+			"integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
+			"dependencies": {
+				"@types/retry": "0.12.0",
+				"retry": "^0.13.1"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
+		"node_modules/p-timeout": {
+			"version": "3.2.0",
+			"resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-3.2.0.tgz",
+			"integrity": "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg==",
+			"dependencies": {
+				"p-finally": "^1.0.0"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
 		"node_modules/p-try": {
 			"version": "2.2.0",
 			"resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
@@ -7625,6 +8631,14 @@
 			"integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
 			"dev": true
 		},
+		"node_modules/retry": {
+			"version": "0.13.1",
+			"resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
+			"integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
+			"engines": {
+				"node": ">= 4"
+			}
+		},
 		"node_modules/reusify": {
 			"version": "1.0.4",
 			"resolved": "https://registry.npmjs.org/reusify/-/reusify-1.0.4.tgz",
@@ -8943,6 +9957,14 @@
 				"defaults": "^1.0.3"
 			}
 		},
+		"node_modules/web-streams-polyfill": {
+			"version": "3.3.2",
+			"resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.2.tgz",
+			"integrity": "sha512-3pRGuxRF5gpuZc0W+EpwQRmCD7gRqcDOMt688KmdlDAgAyaB1XlN0zq2njfDNm44XVdIouE7pZ6GzbdyH47uIQ==",
+			"engines": {
+				"node": ">= 8"
+			}
+		},
 		"node_modules/webidl-conversions": {
 			"version": "3.0.1",
 			"resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -9139,6 +10161,14 @@
 			"integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
 			"dev": true
 		},
+		"node_modules/yaml": {
+			"version": "2.3.4",
+			"resolved": "https://registry.npmjs.org/yaml/-/yaml-2.3.4.tgz",
+			"integrity": "sha512-8aAvwVUSHpfEqTQ4w/KMlf3HcRdt50E5ODIQJBw1fQ5RL34xabzxtUlzTXVqc4rkZsPbvrXKWnABCD7kWSmocA==",
+			"engines": {
+				"node": ">= 14"
+			}
+		},
 		"node_modules/yargs": {
 			"version": "17.7.2",
 			"resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
@@ -9186,6 +10216,22 @@
 			"funding": {
 				"url": "https://github.com/sponsors/sindresorhus"
 			}
+		},
+		"node_modules/zod": {
+			"version": "3.22.4",
+			"resolved": "https://registry.npmjs.org/zod/-/zod-3.22.4.tgz",
+			"integrity": "sha512-iC+8Io04lddc+mVqQ9AZ7OQ2MrUKGN+oIQyq1vemgt46jwCwLfhq7/pwnBnNXXXZb8VTVLKwp9EDkx+ryxIWmg==",
+			"funding": {
+				"url": "https://github.com/sponsors/colinhacks"
+			}
+		},
+		"node_modules/zod-to-json-schema": {
+			"version": "3.22.4",
+			"resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.22.4.tgz",
+			"integrity": "sha512-2Ed5dJ+n/O3cU383xSY28cuVi0BCQhF8nYqWU5paEpl7fVdqdAmiLdqLyfblbNdfOFwFfi/mqU4O1pwc60iBhQ==",
+			"peerDependencies": {
+				"zod": "^3.22.4"
+			}
 		}
 	}
 }
diff --git a/backend/package.json b/backend/package.json
index 1435d8bc..83b42cc6 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -21,6 +21,8 @@
 		"test:e2e": "jest --config ./test/jest-e2e.json"
 	},
 	"dependencies": {
+		"@langchain/community": "^0.0.21",
+		"@langchain/core": "^0.1.18",
 		"@nestjs/common": "^10.0.0",
 		"@nestjs/config": "^3.1.1",
 		"@nestjs/core": "^10.0.0",
@@ -32,6 +34,7 @@
 		"class-transformer": "^0.5.1",
 		"class-validator": "^0.14.1",
 		"markdown-to-txt": "^2.0.1",
+		"langchain": "^0.1.9",
 		"moment": "^2.30.1",
 		"passport-github": "^1.1.0",
 		"passport-jwt": "^4.0.1",
diff --git a/backend/src/app.module.ts b/backend/src/app.module.ts
index afcf5ab4..a474e5cf 100644
--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@@ -10,7 +10,9 @@ import { WorkspaceUsersModule } from "./workspace-users/workspace-users.module";
 import { WorkspaceDocumentsModule } from "./workspace-documents/workspace-documents.module";
 import { DocumentsModule } from "./documents/documents.module";
 import { CheckModule } from "./check/check.module";
-import { AdminModule } from './admin/admin.module';
+import { AdminModule } from "./admin/admin.module";
+import { IntelligenceModule } from "./intelligence/intelligence.module";
+import { LangchainModule } from "./langchain/langchain.module";
 
 @Module({
 	imports: [
@@ -23,6 +25,8 @@ import { AdminModule } from './admin/admin.module';
 		DocumentsModule,
 		CheckModule,
 		AdminModule,
+		IntelligenceModule,
+		LangchainModule,
 	],
 	controllers: [],
 	providers: [
diff --git a/backend/src/intelligence/intelligence.controller.spec.ts b/backend/src/intelligence/intelligence.controller.spec.ts
new file mode 100644
index 00000000..47f0d914
--- /dev/null
+++ b/backend/src/intelligence/intelligence.controller.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from "@nestjs/testing";
+import { IntelligenceController } from "./intelligence.controller";
+
+describe("IntelligenceController", () => {
+	let controller: IntelligenceController;
+
+	beforeEach(async () => {
+		const module: TestingModule = await Test.createTestingModule({
+			controllers: [IntelligenceController],
+		}).compile();
+
+		controller = module.get<IntelligenceController>(IntelligenceController);
+	});
+
+	it("should be defined", () => {
+		expect(controller).toBeDefined();
+	});
+});
diff --git a/backend/src/intelligence/intelligence.controller.ts b/backend/src/intelligence/intelligence.controller.ts
new file mode 100644
index 00000000..0c645652
--- /dev/null
+++ b/backend/src/intelligence/intelligence.controller.ts
@@ -0,0 +1,4 @@
+import { Controller } from "@nestjs/common";
+
+@Controller("intelligence")
+export class IntelligenceController {}
diff --git a/backend/src/intelligence/intelligence.module.ts b/backend/src/intelligence/intelligence.module.ts
new file mode 100644
index 00000000..471ff922
--- /dev/null
+++ b/backend/src/intelligence/intelligence.module.ts
@@ -0,0 +1,11 @@
+import { Module } from "@nestjs/common";
+import { IntelligenceController } from "./intelligence.controller";
+import { IntelligenceService } from "./intelligence.service";
+import { LangchainModule } from "src/langchain/langchain.module";
+
+@Module({
+	imports: [LangchainModule],
+	controllers: [IntelligenceController],
+	providers: [IntelligenceService],
+})
+export class IntelligenceModule {}
diff --git a/backend/src/intelligence/intelligence.service.spec.ts b/backend/src/intelligence/intelligence.service.spec.ts
new file mode 100644
index 00000000..8e2335d4
--- /dev/null
+++ b/backend/src/intelligence/intelligence.service.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from "@nestjs/testing";
+import { IntelligenceService } from "./intelligence.service";
+
+describe("IntelligenceService", () => {
+	let service: IntelligenceService;
+
+	beforeEach(async () => {
+		const module: TestingModule = await Test.createTestingModule({
+			providers: [IntelligenceService],
+		}).compile();
+
+		service = module.get<IntelligenceService>(IntelligenceService);
+	});
+
+	it("should be defined", () => {
+		expect(service).toBeDefined();
+	});
+});
diff --git a/backend/src/intelligence/intelligence.service.ts b/backend/src/intelligence/intelligence.service.ts
new file mode 100644
index 00000000..c9142d88
--- /dev/null
+++ b/backend/src/intelligence/intelligence.service.ts
@@ -0,0 +1,7 @@
+import { Inject, Injectable } from "@nestjs/common";
+import { BaseChatModel } from "@langchain/core/language_models/chat_models";
+
+@Injectable()
+export class IntelligenceService {
+	constructor(@Inject("BaseChatModel") private chatModel: BaseChatModel) {}
+}
diff --git a/backend/src/langchain/langchain.module.ts b/backend/src/langchain/langchain.module.ts
new file mode 100644
index 00000000..a88441c1
--- /dev/null
+++ b/backend/src/langchain/langchain.module.ts
@@ -0,0 +1,14 @@
+import { Module } from "@nestjs/common";
+import { ChatOpenAI } from "@langchain/openai";
+import { BaseChatModel } from "@langchain/core/language_models/chat_models";
+
+const chatModelFactory = {
+	provide: "BaseChatModel",
+	useFactory: () => new ChatOpenAI({}) as BaseChatModel,
+};
+
+@Module({
+	providers: [chatModelFactory],
+	exports: [chatModelFactory],
+})
+export class LangchainModule {}
diff --git a/frontend/.env.development b/frontend/.env.development
index 855fc6af..be08dbc1 100644
--- a/frontend/.env.development
+++ b/frontend/.env.development
@@ -1,3 +1,3 @@
 VITE_API_ADDR="http://localhost:3000"
-VITE_YORKIE_API_ADDR="http://localhost:8080"
-VITE_YORKIE_API_KEY=""
+VITE_YORKIE_API_ADDR="https://api.yorkie.dev"
+VITE_YORKIE_API_KEY="cmftp10ksk14av0kc7gg"
diff --git a/frontend/.env.production b/frontend/.env.production
index 0f882ca0..c7359d7c 100644
--- a/frontend/.env.production
+++ b/frontend/.env.production
@@ -1,3 +1,4 @@
+NODE_ENV=development
 VITE_API_ADDR="https://codepair-api.yorkie.dev"
 VITE_YORKIE_API_ADDR="https://api.yorkie.dev"
 VITE_YORKIE_API_KEY="cmggkp8ksk14av0keupg"
diff --git a/frontend/src/utils/yorkie/remoteSelection.ts b/frontend/src/utils/yorkie/remoteSelection.ts
index aded4de8..553c0b78 100644
--- a/frontend/src/utils/yorkie/remoteSelection.ts
+++ b/frontend/src/utils/yorkie/remoteSelection.ts
@@ -130,81 +130,7 @@ export class YorkieRemoteSelectionsPluginValue {
 		this.conf = view.state.facet(yorkieSyncFacet);
 
 		this.unsubscribe = this.conf.doc.subscribe("others", (event) => {
-			const decorations: Array<cmState.Range<cmView.Decoration>> = [];
 			if (["presence-changed", "unwatched"].includes(event.type)) {
-				this.conf.doc.getPresences().forEach((presence) => {
-					if (presence.clientID === this.conf.client.getID()) {
-						return;
-					}
-					if (presence.presence.selection == null) {
-						return;
-					}
-					const cursor = this.conf.doc
-						.getRoot()
-						.content.posRangeToIndexRange(presence.presence.selection);
-					const color = presence.presence.color;
-					const name = presence.presence.name;
-					const start = Math.min(cursor[0], cursor[1]);
-					const end = Math.max(cursor[0], cursor[1]);
-					const startLine = view.state.doc.lineAt(start);
-					const endLine = view.state.doc.lineAt(end);
-					if (startLine.number === endLine.number) {
-						// selected content in a single line.
-						decorations.push({
-							from: start,
-							to: end,
-							value: cmView.Decoration.mark({
-								attributes: { style: `background-color: ${color}` },
-								class: "cm-ySelection",
-							}),
-						});
-					} else {
-						// selected content in multiple lines
-						// first, render text-selection in the first line
-						decorations.push({
-							from: start,
-							to: startLine.from + startLine.length,
-							value: cmView.Decoration.mark({
-								attributes: { style: `background-color: ${color}` },
-								class: "cm-ySelection",
-							}),
-						});
-						// render text-selection in the last line
-						decorations.push({
-							from: endLine.from,
-							to: end,
-							value: cmView.Decoration.mark({
-								attributes: { style: `background-color: ${color}` },
-								class: "cm-ySelection",
-							}),
-						});
-						for (let i = startLine.number + 1; i < endLine.number; i++) {
-							const linePos = view.state.doc.line(i).from;
-							const linePosTo = view.state.doc.line(i).to;
-							decorations.push({
-								from: linePos,
-								to: linePosTo,
-								value: cmView.Decoration.mark({
-									attributes: {
-										style: `background-color: ${color}`,
-										class: "cm-ySelection",
-									},
-								}),
-							});
-						}
-					}
-					decorations.push({
-						from: cursor[0],
-						to: cursor[0],
-						value: cmView.Decoration.widget({
-							side: cursor[0] - cursor[1] > 0 ? -1 : 1, // the local cursor should be rendered outside the remote selection
-							block: false,
-							widget: new YRemoteCaretWidget(color, name),
-						}),
-					});
-				});
-				this.decorations = cmView.Decoration.set(decorations, true);
-
 				view.dispatch({ annotations: [yorkieRemoteSelectionsAnnotation.of([])] });
 			}
 		});
@@ -216,6 +142,8 @@ export class YorkieRemoteSelectionsPluginValue {
 	}
 
 	update(update: cmView.ViewUpdate) {
+		const decorations: Array<cmState.Range<cmView.Decoration>> = [];
+
 		this.conf.doc.update((root, presence) => {
 			const hasFocus = update.view.hasFocus && update.view.dom.ownerDocument.hasFocus();
 			const sel = hasFocus ? update.state.selection.main : null;
@@ -225,8 +153,85 @@ export class YorkieRemoteSelectionsPluginValue {
 				presence.set({
 					selection,
 				});
+			} else if (presence.get("selection")) {
+				presence.set({
+					selection: null,
+				});
+			}
+		});
+
+		this.conf.doc.getPresences().forEach((presence) => {
+			if (presence.clientID === this.conf.client.getID()) {
+				return;
+			}
+			if (presence.presence.selection == null) {
+				return;
+			}
+			const cursor = this.conf.doc
+				.getRoot()
+				.content.posRangeToIndexRange(presence.presence.selection);
+			const color = presence.presence.color;
+			const name = presence.presence.name;
+			const start = Math.min(cursor[0], cursor[1]);
+			const end = Math.max(cursor[0], cursor[1]);
+			const startLine = update.view.state.doc.lineAt(start);
+			const endLine = update.view.state.doc.lineAt(end);
+			if (startLine.number === endLine.number) {
+				// selected content in a single line.
+				decorations.push({
+					from: start,
+					to: end,
+					value: cmView.Decoration.mark({
+						attributes: { style: `background-color: ${color}` },
+						class: "cm-ySelection",
+					}),
+				});
+			} else {
+				// selected content in multiple lines
+				// first, render text-selection in the first line
+				decorations.push({
+					from: start,
+					to: startLine.from + startLine.length,
+					value: cmView.Decoration.mark({
+						attributes: { style: `background-color: ${color}` },
+						class: "cm-ySelection",
+					}),
+				});
+				// render text-selection in the last line
+				decorations.push({
+					from: endLine.from,
+					to: end,
+					value: cmView.Decoration.mark({
+						attributes: { style: `background-color: ${color}` },
+						class: "cm-ySelection",
+					}),
+				});
+				for (let i = startLine.number + 1; i < endLine.number; i++) {
+					const linePos = update.view.state.doc.line(i).from;
+					const linePosTo = update.view.state.doc.line(i).to;
+					decorations.push({
+						from: linePos,
+						to: linePosTo,
+						value: cmView.Decoration.mark({
+							attributes: {
+								style: `background-color: ${color}`,
+								class: "cm-ySelection",
+							},
+						}),
+					});
+				}
 			}
+			decorations.push({
+				from: cursor[0],
+				to: cursor[0],
+				value: cmView.Decoration.widget({
+					side: cursor[0] - cursor[1] > 0 ? -1 : 1, // the local cursor should be rendered outside the remote selection
+					block: false,
+					widget: new YRemoteCaretWidget(color, name),
+				}),
+			});
 		});
+		this.decorations = cmView.Decoration.set(decorations, true);
 	}
 }