diff --git a/.github/workflows/auto-close-issue.yml b/.github/workflows/auto-close-issue.yml
new file mode 100644
index 000000000..45ef3aa66
--- /dev/null
+++ b/.github/workflows/auto-close-issue.yml
@@ -0,0 +1,20 @@
+name: Auto Close Issues on Merge
+
+on:
+  pull_request:
+    types: [opened] # closed로 바꾸기
+
+jobs:
+  close-related-issue:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.merged == true && github.base.ref != 'main'
+    steps:
+      - name: Extract and Close Issue
+        run: |
+          PR_BODY="${{ github.event.pull_request.body }}"
+          ISSUE_NUMBERS=$(echo $PR_BODY | grep -oP 'close #\d+' | awk '{print substr($2, 2)}')
+          for ISSUE_NUMBER in $ISSUE_NUMBERS; do
+            gh api -X PATCH /repos/${{ github.repository }}/issues/$ISSUE_NUMBER --field state=closed
+          done
+        env:
+          GITHUB_TOKEN: ${{ secrets.AUTO_CLOSE_GITHUB_TOKEN }}
diff --git a/backend/http/offering.http b/backend/http/offering.http
index d10292837..19cd5fadd 100644
--- a/backend/http/offering.http
+++ b/backend/http/offering.http
@@ -2,7 +2,7 @@
 GET {{base-url}}/offerings/1
 
 ### 공모 목록 조회 API
-GET {{base-url}}/offerings?filter=RECENT&search=&last-id=99&page-size=2
+GET {{base-url}}/offerings
 
 ### 공모 필터 목록 조회 API
 GET {{base-url}}/offerings/filters
diff --git a/backend/src/main/java/com/zzang/chongdae/offering/repository/OfferingRepository.java b/backend/src/main/java/com/zzang/chongdae/offering/repository/OfferingRepository.java
index 5cbaaf7d7..edb224b62 100644
--- a/backend/src/main/java/com/zzang/chongdae/offering/repository/OfferingRepository.java
+++ b/backend/src/main/java/com/zzang/chongdae/offering/repository/OfferingRepository.java
@@ -22,7 +22,8 @@ public interface OfferingRepository extends JpaRepository<OfferingEntity, Long>
     @Query("""
             SELECT o
             FROM OfferingEntity o
-            WHERE o.id < :lastId AND (o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
+            WHERE o.id < :lastId
+                AND (:keyword IS NULL OR o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
             ORDER BY o.id DESC
             """)
     List<OfferingEntity> findRecentOfferingsWithKeyword(Long lastId, String keyword, Pageable pageable);
@@ -31,7 +32,7 @@ public interface OfferingRepository extends JpaRepository<OfferingEntity, Long>
             SELECT o
             FROM OfferingEntity o
             WHERE (o.deadline > :lastDeadline OR (o.deadline = :lastDeadline AND o.id < :lastId))
-                AND (o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
+                AND (:keyword IS NULL OR o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
             ORDER BY o.deadline ASC, o.id DESC
             """)
     List<OfferingEntity> findImminentOfferingsWithKeyword(
@@ -42,7 +43,7 @@ List<OfferingEntity> findImminentOfferingsWithKeyword(
             FROM OfferingEntity o
             WHERE ((o.eachPrice - (o.totalPrice * 1.0 / o.totalCount)) / o.eachPrice < :discountRate
                     OR ((o.eachPrice - (o.totalPrice * 1.0 / o.totalCount)) / o.eachPrice = :discountRate AND o.id < :lastId))
-                AND (o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
+               AND (:keyword IS NULL OR o.title LIKE %:keyword% OR o.meetingAddress LIKE %:keyword%)
             ORDER BY (o.eachPrice - (o.totalPrice * 1.0 / o.totalCount)) / o.eachPrice DESC, o.id DESC
             """)
     List<OfferingEntity> findHighDiscountOfferingsWithKeyword(
diff --git a/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java b/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
index 876543154..e30a611c7 100644
--- a/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
+++ b/backend/src/test/java/com/zzang/chongdae/offering/integration/OfferingIntegrationTest.java
@@ -119,10 +119,10 @@ class GetAllOffering {
 
         List<ParameterDescriptorWithType> queryParameterDescriptors = List.of(
                 parameterWithName("filter").description("필터 이름 (기본값: RECENT)"
-                        + getEnumValuesAsString(OfferingFilter.class)),
-                parameterWithName("search").description("검색어"),
-                parameterWithName("last-id").description("마지막 공모 id"),
-                parameterWithName("page-size").description("페이지 크기 (기본값: 10)")
+                        + getEnumValuesAsString(OfferingFilter.class)).optional(),
+                parameterWithName("search").description("검색어").optional(),
+                parameterWithName("last-id").description("마지막 공모 id").optional(),
+                parameterWithName("page-size").description("페이지 크기 (기본값: 10)").optional()
         );
         List<FieldDescriptor> successResponseDescriptors = List.of(
                 fieldWithPath("offerings[].id").description("공모 id"),