diff --git a/src/app.module.ts b/src/app.module.ts
index aa98702..05ac71f 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -11,9 +11,10 @@ import { UsersModule } from './modules/users/users.module';
 import { ClassificationModule } from './modules/classification/classification.module';
 import { AuthModule } from './modules/auth/auth.module';
 import { FoldersModule } from './modules/folders/folders.module';
-import { LinksModule } from './modules/links/links.module';
 import { PostsModule } from './modules/posts/posts.module';
+import { LinksModule } from './modules/links/links.module';
 import { AwsLambdaModule } from './infrastructure/aws-lambda/aws-lambda.module';
+import { OnboardModule } from './modules/onboard/onboard.module';
 
 @Module({
   imports: [
@@ -27,10 +28,11 @@ import { AwsLambdaModule } from './infrastructure/aws-lambda/aws-lambda.module';
     UsersModule,
     ClassificationModule,
     AuthModule,
+    PostsModule,
     FoldersModule,
     LinksModule,
-    PostsModule,
     AwsLambdaModule,
+    OnboardModule,
   ],
   controllers: [AppController],
   providers: [AppService],
diff --git a/src/modules/folders/folders.module.ts b/src/modules/folders/folders.module.ts
index 77b4e99..5eee094 100644
--- a/src/modules/folders/folders.module.ts
+++ b/src/modules/folders/folders.module.ts
@@ -1,10 +1,9 @@
-import { Module } from '@nestjs/common';
+import { forwardRef, Module } from '@nestjs/common';
 import { FoldersService } from './folders.service';
 import { FoldersController } from './folders.controller';
 import { MongooseModule } from '@nestjs/mongoose';
 import { Folder, FolderSchema, Post, PostSchema } from '@src/infrastructure';
 import { FolderRepository } from './folders.repository';
-import { PostsRepository } from '../posts/posts.repository';
 import { PostsModule } from '../posts/posts.module';
 
 @Module({
@@ -13,9 +12,10 @@ import { PostsModule } from '../posts/posts.module';
       { name: Post.name, schema: PostSchema },
       { name: Folder.name, schema: FolderSchema },
     ]),
-    PostsModule,
+    forwardRef(() => PostsModule),
   ],
   controllers: [FoldersController],
-  providers: [FoldersService, FolderRepository, PostsRepository],
+  providers: [FoldersService, FolderRepository],
+  exports: [FolderRepository, FoldersService],
 })
 export class FoldersModule {}
diff --git a/src/modules/folders/folders.service.ts b/src/modules/folders/folders.service.ts
index 636aeb1..e20d027 100644
--- a/src/modules/folders/folders.service.ts
+++ b/src/modules/folders/folders.service.ts
@@ -1,16 +1,16 @@
-import { Injectable } from '@nestjs/common';
+import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { CreateFolderDto, UpdateFolderDto } from './dto/mutate-folder.dto';
-import { HydratedDocument, Schema as MongooseSchema } from 'mongoose';
+import { Schema as MongooseSchema } from 'mongoose';
 import { FolderWithCount } from './dto/folder-with-count.dto';
 import { FolderRepository } from './folders.repository';
 import { PostsRepository } from '../posts/posts.repository';
 import { FolderType } from '@src/infrastructure/database/types/folder-type.enum';
-import { Type } from 'class-transformer';
 
 @Injectable()
 export class FoldersService {
   constructor(
     private readonly folderRepository: FolderRepository,
+    @Inject(forwardRef(() => PostsRepository))
     private readonly postRepository: PostsRepository,
   ) {}
 
diff --git a/src/modules/folders/responses/post.response.ts b/src/modules/folders/responses/post.response.ts
index fc19f9e..9960bda 100644
--- a/src/modules/folders/responses/post.response.ts
+++ b/src/modules/folders/responses/post.response.ts
@@ -37,7 +37,7 @@ export class PostResponse {
   isFavorite: boolean;
 
   @ApiProperty()
-  createdAt: string;
+  createdAt: Date;
 
   @ApiProperty({ type: Keyword, isArray: true })
   keywords: Keyword[];
diff --git a/src/modules/onboard/onboard.const.ts b/src/modules/onboard/onboard.const.ts
new file mode 100644
index 0000000..e8523bd
--- /dev/null
+++ b/src/modules/onboard/onboard.const.ts
@@ -0,0 +1,34 @@
+export const onBoardCategoryList = [
+  '경제',
+  '디자인',
+  '개발',
+  '쇼핑',
+  '요리법',
+  '여행',
+  '음악',
+  'UX',
+  '자기개발',
+  '금융',
+  '소셜',
+  '미디어',
+  '뉴스',
+  '오락',
+  '비즈니스',
+  '건강',
+  '부동산',
+  '세계',
+  '예술',
+  '스포츠',
+  '경영',
+  '운동',
+  '기술',
+  '영화',
+  '책',
+  '사진',
+  '교육',
+  '과학',
+  '패션',
+  '정치',
+  '생산성',
+  '환경',
+];
diff --git a/src/modules/onboard/onboard.controller.spec.ts b/src/modules/onboard/onboard.controller.spec.ts
new file mode 100644
index 0000000..99959df
--- /dev/null
+++ b/src/modules/onboard/onboard.controller.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { OnboardController } from './onboard.controller';
+
+describe('OnboardController', () => {
+  let controller: OnboardController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [OnboardController],
+    }).compile();
+
+    controller = module.get<OnboardController>(OnboardController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});
diff --git a/src/modules/onboard/onboard.controller.ts b/src/modules/onboard/onboard.controller.ts
new file mode 100644
index 0000000..088bbca
--- /dev/null
+++ b/src/modules/onboard/onboard.controller.ts
@@ -0,0 +1,12 @@
+import { Controller, Get } from '@nestjs/common';
+import { OnboardService } from './onboard.service';
+
+@Controller('onboard')
+export class OnboardController {
+  constructor(private readonly onboardService: OnboardService) {}
+
+  @Get()
+  getOnboardCategories() {
+    return this.onboardService.getOnboardCategories();
+  }
+}
diff --git a/src/modules/onboard/onboard.module.ts b/src/modules/onboard/onboard.module.ts
new file mode 100644
index 0000000..2432668
--- /dev/null
+++ b/src/modules/onboard/onboard.module.ts
@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { OnboardController } from './onboard.controller';
+import { OnboardService } from './onboard.service';
+
+@Module({
+  controllers: [OnboardController],
+  providers: [OnboardService],
+})
+export class OnboardModule {}
diff --git a/src/modules/onboard/onboard.service.spec.ts b/src/modules/onboard/onboard.service.spec.ts
new file mode 100644
index 0000000..1123afc
--- /dev/null
+++ b/src/modules/onboard/onboard.service.spec.ts
@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { OnboardService } from './onboard.service';
+
+describe('OnboardService', () => {
+  let service: OnboardService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [OnboardService],
+    }).compile();
+
+    service = module.get<OnboardService>(OnboardService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});
diff --git a/src/modules/onboard/onboard.service.ts b/src/modules/onboard/onboard.service.ts
new file mode 100644
index 0000000..b318467
--- /dev/null
+++ b/src/modules/onboard/onboard.service.ts
@@ -0,0 +1,9 @@
+import { Injectable } from '@nestjs/common';
+import { onBoardCategoryList } from './onboard.const';
+
+@Injectable()
+export class OnboardService {
+  getOnboardCategories() {
+    return onBoardCategoryList;
+  }
+}
diff --git a/src/modules/posts/posts.module.ts b/src/modules/posts/posts.module.ts
index a475a07..f604a20 100644
--- a/src/modules/posts/posts.module.ts
+++ b/src/modules/posts/posts.module.ts
@@ -1,13 +1,13 @@
-import { Module } from '@nestjs/common';
+import { forwardRef, Module } from '@nestjs/common';
 import { PostsService } from './posts.service';
 import { PostsController } from './posts.controller';
 import { PostsRepository } from '@src/modules/posts/posts.repository';
 import { MongooseModule } from '@nestjs/mongoose';
 import { Folder, FolderSchema, Post, PostSchema } from '@src/infrastructure';
 import { UsersModule } from '@src/modules/users/users.module';
-import { FolderRepository } from '../folders/folders.repository';
 import { AwsLambdaModule } from '@src/infrastructure/aws-lambda/aws-lambda.module';
 import { AwsLambdaService } from '@src/infrastructure/aws-lambda/aws-lambda.service';
+import { FoldersModule } from '../folders/folders.module';
 
 @Module({
   imports: [
@@ -15,16 +15,12 @@ import { AwsLambdaService } from '@src/infrastructure/aws-lambda/aws-lambda.serv
       { name: Post.name, schema: PostSchema },
       { name: Folder.name, schema: FolderSchema },
     ]),
+    forwardRef(() => FoldersModule),
     UsersModule,
     AwsLambdaModule,
   ],
   controllers: [PostsController],
-  providers: [
-    PostsService,
-    PostsRepository,
-    FolderRepository,
-    AwsLambdaService,
-  ],
-  exports: [PostsService],
+  providers: [PostsService, PostsRepository, AwsLambdaService],
+  exports: [PostsService, PostsRepository],
 })
 export class PostsModule {}
diff --git a/src/modules/posts/posts.service.ts b/src/modules/posts/posts.service.ts
index 27964ae..d74d766 100644
--- a/src/modules/posts/posts.service.ts
+++ b/src/modules/posts/posts.service.ts
@@ -1,4 +1,4 @@
-import { Injectable } from '@nestjs/common';
+import { forwardRef, Inject, Injectable } from '@nestjs/common';
 import { CreatePostDto } from '@src/modules/posts/dto/create-post.dto';
 import { PostsRepository } from '@src/modules/posts/posts.repository';
 import { GetPostQueryDto } from './dto/find-in-folder.dto';
@@ -11,6 +11,7 @@ import { ConfigService } from '@nestjs/config';
 export class PostsService {
   constructor(
     private readonly postRepository: PostsRepository,
+    @Inject(forwardRef(() => FolderRepository))
     private readonly folderRepository: FolderRepository,
     private readonly awsLambdaService: AwsLambdaService,
     private readonly config: ConfigService,