diff --git a/backend/src/main/java/com/mapbefine/mapbefine/topic/application/TopicCommandService.java b/backend/src/main/java/com/mapbefine/mapbefine/topic/application/TopicCommandService.java
index c777e9daf..9625b0210 100644
--- a/backend/src/main/java/com/mapbefine/mapbefine/topic/application/TopicCommandService.java
+++ b/backend/src/main/java/com/mapbefine/mapbefine/topic/application/TopicCommandService.java
@@ -136,15 +136,13 @@ private void validateCopyablePins(AuthMember member, List<Pin> originalPins) {
     public Long merge(AuthMember member, TopicMergeRequest request) {
         Topic topic = convertToTopic(member, request);
         List<Topic> originalTopics = findAllTopics(request.topics());
-
         validateCopyableTopics(member, originalTopics);
-
         List<Pin> originalPins = getAllPinsFromTopics(originalTopics);
 
         topic.increasePinCount(originalPins.size());
         topic.updateLastPinUpdatedAt(LocalDateTime.now());
+
         topicRepository.save(topic);
-        topicRepository.flush();
         pinRepository.saveAllToTopic(topic, originalPins);
         return topic.getId();
     }