diff --git a/backend/src/main/java/com/mapbefine/mapbefine/admin/application/AdminCommandService.java b/backend/src/main/java/com/mapbefine/mapbefine/admin/application/AdminCommandService.java
index 989a79f0..05119b27 100644
--- a/backend/src/main/java/com/mapbefine/mapbefine/admin/application/AdminCommandService.java
+++ b/backend/src/main/java/com/mapbefine/mapbefine/admin/application/AdminCommandService.java
@@ -117,6 +117,7 @@ public void deletePin(Long pinId) {
                 .orElseThrow(() -> new PinNotFoundException(PIN_NOT_FOUND, pinId));
 
         pin.decreaseTopicPinCount();
+        pinRepository.flush();
         pinImageRepository.deleteAllByPinId(pinId);
         pinRepository.deleteById(pin.getId());
     }
diff --git a/backend/src/test/java/com/mapbefine/mapbefine/admin/AdminIntegrationTest.java b/backend/src/test/java/com/mapbefine/mapbefine/admin/AdminIntegrationTest.java
index 109c9380..54eb8662 100644
--- a/backend/src/test/java/com/mapbefine/mapbefine/admin/AdminIntegrationTest.java
+++ b/backend/src/test/java/com/mapbefine/mapbefine/admin/AdminIntegrationTest.java
@@ -1,6 +1,6 @@
 package com.mapbefine.mapbefine.admin;
 
-import static io.restassured.RestAssured.given;
+import static io.restassured.RestAssured.*;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.springframework.http.HttpHeaders.AUTHORIZATION;
 
@@ -23,7 +23,8 @@
 import com.mapbefine.mapbefine.topic.TopicFixture;
 import com.mapbefine.mapbefine.topic.domain.Topic;
 import com.mapbefine.mapbefine.topic.domain.TopicRepository;
-import io.restassured.common.mapper.TypeRef;
+import io.restassured.common.mapper.*;
+import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -32,8 +33,6 @@
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 
-import java.util.List;
-
 class AdminIntegrationTest extends IntegrationTest {
 
     @Autowired
@@ -124,15 +123,13 @@ void findMemberDetail_Success() {
                 .extract()
                 .as(new TypeRef<>() {
                 });
-        System.out.println("====" + topic.getPinCount());
-        //then
 
+        //then
         AdminMemberDetailResponse expected = AdminMemberDetailResponse.of(
                 member,
                 member.getCreatedTopics(),
                 member.getCreatedPins()
         );
-
         assertThat(response).usingRecursiveComparison()
                 .ignoringFields("updatedAt")
                 .ignoringFields("topics.updatedAt")
@@ -218,6 +215,9 @@ void deletePin_Success() {
                 .when().delete("/admin/pins/" + pin.getId())
                 .then().log().all()
                 .statusCode(HttpStatus.NO_CONTENT.value());
+
+        Topic updatedTopic = topicRepository.findById(topic.getId()).get();
+        assertThat(updatedTopic.getPinCount()).isEqualTo(0);
     }
 
     @Test
diff --git a/backend/src/test/java/com/mapbefine/mapbefine/admin/application/AdminCommandServiceTest.java b/backend/src/test/java/com/mapbefine/mapbefine/admin/application/AdminCommandServiceTest.java
index 288eefda..5115f01a 100644
--- a/backend/src/test/java/com/mapbefine/mapbefine/admin/application/AdminCommandServiceTest.java
+++ b/backend/src/test/java/com/mapbefine/mapbefine/admin/application/AdminCommandServiceTest.java
@@ -160,6 +160,20 @@ void deletePin_Success() {
         assertThat(pinRepository.existsById(pin.getId())).isFalse();
     }
 
+    @DisplayName("핀 삭제 시, 토픽의 핀 개수를 1 감소시킨다.")
+    @Test
+    void deletePin_Success_decreaseTopicPinCount() {
+        //given
+        assertThat(pin.isDeleted()).isFalse();
+        int pinCountBeforeDelete = topic.getPinCount();
+
+        //when
+        adminCommandService.deletePin(pin.getId());
+
+        //then
+        assertThat(topic.getPinCount()).isEqualTo(pinCountBeforeDelete - 1);
+    }
+
     @DisplayName("Admin인 경우, 핀 이미지를 삭제할 수 있다.")
     @Test
     void deletePinImage_Success() {