diff --git a/core/service.go b/core/service.go
index 453a8c9..082062d 100644
--- a/core/service.go
+++ b/core/service.go
@@ -422,11 +422,14 @@ func (sh *serviceDescription) link(w http.ResponseWriter, r *http.Request) {
 
 	if guestlink {
 		//기존 게스트 링크 삭제
-		guestLinkId, err := primitive.ObjectIDFromHex(oldId)
+		link, err = sh.mongoClient.FindOneAndDelete(CollectionLink, bson.M{
+			"platform": oldType,
+			"uid":      oldId,
+		}, options.FindOneAndDelete().SetProjection(bson.M{"_id": 1}))
+
 		if err == nil {
-			_, err = sh.mongoClient.Delete(CollectionLink, bson.M{
-				"platform": oldType,
-				"_id":      guestLinkId,
+			sh.mongoClient.Delete(CollectionAccount, bson.M{
+				"_id": link["_id"].(primitive.ObjectID),
 			})
 		}
 	}