diff --git a/src/main/java/com/palnet/biz/api/bas/group/service/BasGroupJoinService.java b/src/main/java/com/palnet/biz/api/bas/group/service/BasGroupJoinService.java
index 2c9b620..bcc271f 100644
--- a/src/main/java/com/palnet/biz/api/bas/group/service/BasGroupJoinService.java
+++ b/src/main/java/com/palnet/biz/api/bas/group/service/BasGroupJoinService.java
@@ -79,6 +79,7 @@ public class BasGroupJoinService {
 			PtyCstmrGroup entity = ptyCstmrGroupRepository.findRejoinUser(rq.getGroupId(), rq.getCstmrSno());
 			entity.setJoinYn("Y");
 			entity.setJoinDt(DateUtils.nowDate());
+			ptyCstmrGroupRepository.updateWithdrwDt(rq.getGroupId(), rq.getCstmrSno());
 			if(ptyCstmrGroupRepository.save(entity) == null)
 				throw new CustomException(ErrorCode.FAIL);
 			}
diff --git a/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java b/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
index 376a113..02de1f2 100644
--- a/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
+++ b/src/main/java/com/palnet/biz/jpa/repository/pty/PtyCstmrGroupRepository.java
@@ -3,9 +3,11 @@ package com.palnet.biz.jpa.repository.pty;
 import java.util.List;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
 
 import com.palnet.biz.jpa.entity.PtyCstmrGroup;
 
@@ -30,4 +32,13 @@ public interface PtyCstmrGroupRepository extends JpaRepository<PtyCstmrGroup, In
     		"where p.groupId = :groupId " +
     		"and p.cstmrSno = :cstmrSno")
     PtyCstmrGroup findRejoinUser(@Param("groupId") String groupId, @Param("cstmrSno") int cstmrSno);
+    
+	@Transactional
+	@Modifying
+    @Query(value = "UPDATE PTY_CSTMR_GROUP " +
+    		"SET WTHDRW_DT = null " +
+    		"WHERE GROUP_ID = :groupId " +
+    		"AND CSTMR_SNO = :cstmrSno "
+    		,nativeQuery = true )
+    void updateWithdrwDt(@Param("groupId") String groupId, @Param("cstmrSno") int cstmrSno);
 }