diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountController.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountController.java
index 21e0026a..8b19581b 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountController.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountController.java
@@ -2,6 +2,7 @@
 
 import lombok.RequiredArgsConstructor;
 import org.samtuap.inong.domain.discount.dto.DiscountCreateRequest;
+import org.samtuap.inong.domain.discount.dto.DiscountDetailResponse;
 import org.samtuap.inong.domain.discount.dto.DiscountResponse;
 import org.samtuap.inong.domain.discount.dto.DiscountUpdateRequest;
 import org.samtuap.inong.domain.discount.service.DiscountService;
@@ -54,7 +55,7 @@ public ResponseEntity<Page<DiscountResponse>> getDiscountList(
 
     // 할인 디테일 조회
     @GetMapping("/{discountId}/detail")
-    public ResponseEntity<DiscountResponse> getDiscountDetail(@PathVariable("discountId") Long discountId) {
+    public ResponseEntity<DiscountDetailResponse> getDiscountDetail(@PathVariable("discountId") Long discountId) {
         return new ResponseEntity<>(discountService.getDiscountDetail(discountId), HttpStatus.OK);
     }
 }
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountScheduler.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountScheduler.java
index 98918f97..f1461f22 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountScheduler.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/api/DiscountScheduler.java
@@ -51,4 +51,4 @@ public void applyDiscounts() {
 
         Objects.requireNonNull(cacheManager.getCache("PackageDetail")).clear();
     }
-}
+}
\ No newline at end of file
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountDetailResponse.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountDetailResponse.java
new file mode 100644
index 00000000..0cfa25d6
--- /dev/null
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountDetailResponse.java
@@ -0,0 +1,28 @@
+package org.samtuap.inong.domain.discount.dto;
+
+import lombok.Builder;
+import org.samtuap.inong.domain.discount.entity.Discount;
+
+import java.time.LocalDate;
+import java.util.List;
+
+@Builder
+public record DiscountDetailResponse(
+        Long id,
+        Integer discount,
+        LocalDate startAt,
+        LocalDate endAt,
+        boolean discountActive,
+        List<Long>productIdList
+) {
+    public static DiscountDetailResponse fromEntity(Discount discount, List<Long> productIdList) {
+        return DiscountDetailResponse.builder()
+                .id(discount.getId())
+                .discount(discount.getDiscount())
+                .startAt(discount.getStartAt())
+                .endAt(discount.getEndAt())
+                .discountActive(discount.isDiscountActive())
+                .productIdList(productIdList)
+                .build();
+    }
+}
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountUpdateRequest.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountUpdateRequest.java
index fec2ab66..003681ea 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountUpdateRequest.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/dto/DiscountUpdateRequest.java
@@ -4,13 +4,15 @@
 import org.samtuap.inong.domain.discount.entity.Discount;
 
 import java.time.LocalDate;
+import java.util.List;
 
 @Builder
 public record DiscountUpdateRequest(
         Integer discount,
         LocalDate startAt,
         LocalDate endAt,
-        boolean discountActive
+        boolean discountActive,
+        List<Long> productIdList
 ) {
     public void updateEntity(Discount discount) {
         discount.updateDiscount(this.discount, this.startAt, this.endAt, this.discountActive);
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/entity/Discount.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/entity/Discount.java
index 2bd9f9f8..6db086e4 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/entity/Discount.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/entity/Discount.java
@@ -6,6 +6,7 @@
 import org.hibernate.annotations.SQLRestriction;
 import org.samtuap.inong.domain.common.BaseEntity;
 import java.time.LocalDate;
+import java.util.List;
 
 @Getter
 @Entity
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/repository/DiscountRepository.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/repository/DiscountRepository.java
index 819fb77e..aa2aa874 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/repository/DiscountRepository.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/repository/DiscountRepository.java
@@ -14,6 +14,10 @@ public interface DiscountRepository extends JpaRepository<Discount, Long> {
 
     List<Discount> findAllByEndAtBefore(LocalDate now);
 
+    List<Discount> findAllByStartAtLessThanEqualAndDiscountActiveFalse(LocalDate now);
+
+    List<Discount> findAllByEndAtLessThanEqualAndDiscountActiveTrue(LocalDate now);
+
     List<Discount> findAll();
 
     default Discount findByIdThrow(Long id) {
diff --git a/backend/product/src/main/java/org/samtuap/inong/domain/discount/service/DiscountService.java b/backend/product/src/main/java/org/samtuap/inong/domain/discount/service/DiscountService.java
index c528e00f..292fd054 100644
--- a/backend/product/src/main/java/org/samtuap/inong/domain/discount/service/DiscountService.java
+++ b/backend/product/src/main/java/org/samtuap/inong/domain/discount/service/DiscountService.java
@@ -4,6 +4,7 @@
 import lombok.extern.slf4j.Slf4j;
 import org.samtuap.inong.common.exception.BaseCustomException;
 import org.samtuap.inong.domain.discount.dto.DiscountCreateRequest;
+import org.samtuap.inong.domain.discount.dto.DiscountDetailResponse;
 import org.samtuap.inong.domain.discount.dto.DiscountResponse;
 import org.samtuap.inong.domain.discount.dto.DiscountUpdateRequest;
 import org.samtuap.inong.domain.discount.entity.Discount;
@@ -18,6 +19,8 @@
 
 import java.time.LocalDate;
 import java.util.List;
+import java.util.stream.Collectors;
+
 import static org.samtuap.inong.common.exceptionType.ProductExceptionType.*;
 
 @Slf4j
@@ -69,13 +72,47 @@ public void updateDiscount(Long discountId, DiscountUpdateRequest request) {
             log.info(">>>>날짜 : " + existingDiscount.getStartAt() + " >>>> 오늘보다 이후 => 비활성화");
             existingDiscount.updateDiscountActive(false);
         }
-        // 변경된 할인이 적용된 상품의 캐시 삭제 처리
-        List<PackageProduct> discountProducts = packageProductRepository.findAllByDiscountId(discountId);
-        if(!discountProducts.isEmpty()){
-            for (PackageProduct product : discountProducts) {
-                cacheManager.getCache("PackageDetail").evict(product.getId());
+
+        // 기존에 할인에 적용된 상품들의 ID 리스트
+        List<PackageProduct> existingProducts = packageProductRepository.findAllByDiscountId(discountId);
+        List<Long> existingProductIds = existingProducts.stream()
+                .map(PackageProduct::getId)
+                .collect(Collectors.toList());
+
+        // 요청으로 받은 새로운 상품 ID 리스트
+        List<Long> newProductIds = request.productIdList();
+
+        // 할인에서 제거할 상품들 (기존에 있었지만 새 리스트에는 없는 상품들)
+        List<Long> productsToRemoveDiscount = existingProductIds.stream()
+                .filter(id -> !newProductIds.contains(id))
+                .collect(Collectors.toList());
+        for (Long productId : productsToRemoveDiscount) {
+            PackageProduct product = packageProductRepository.findByIdOrThrow(productId);
+            product.updateDiscountId(null);
+            cacheManager.getCache("PackageDetail").evict(productId);
+        }
+
+        // 할인에 새로 추가할 상품들 (새 리스트에는 있지만 기존에 없었던 상품들)
+        List<Long> productsToAddDiscount = newProductIds.stream()
+                .filter(id -> !existingProductIds.contains(id))
+                .collect(Collectors.toList());
+        for (Long productId : productsToAddDiscount) {
+            PackageProduct product = packageProductRepository.findByIdOrThrow(productId);
+            if (product.getDiscountId() == null) {
+                product.updateDiscountId(discountId);
+            } else {
+                throw new BaseCustomException(DISCOUNT_ALREADY_EXISTS);
             }
+            cacheManager.getCache("PackageDetail").evict(productId);
         }
+
+//        // 변경된 할인이 적용된 상품의 캐시 삭제 처리
+//        List<PackageProduct> discountProducts = packageProductRepository.findAllByDiscountId(discountId);
+//        if(!discountProducts.isEmpty()){
+//            for (PackageProduct product : discountProducts) {
+//                cacheManager.getCache("PackageDetail").evict(product.getId());
+//            }
+//        }
         discountRepository.save(existingDiscount);
     }
 
@@ -101,9 +138,16 @@ public Page<DiscountResponse> getDiscountList(Pageable pageable) {
     }
 
     // 할인 디테일 조회
-    public DiscountResponse getDiscountDetail(Long discountId) {
+    public DiscountDetailResponse getDiscountDetail(Long discountId) {
         Discount discount = discountRepository.findById(discountId)
                 .orElseThrow(() -> new BaseCustomException(DISCOUNT_NOT_FOUND));
-        return DiscountResponse.fromEntity(discount);
+
+        // 해당 할인에 적용된 상품들의 ID 리스트 조회
+        List<PackageProduct> productList = packageProductRepository.findAllByDiscountId(discountId);
+        List<Long> productIdList = productList.stream()
+                .map(PackageProduct::getId)
+                .collect(Collectors.toList());
+
+        return DiscountDetailResponse.fromEntity(discount, productIdList);
     }
 }