diff --git a/core/service.go b/core/service.go
index fc9df45..a7b40a4 100644
--- a/core/service.go
+++ b/core/service.go
@@ -673,18 +673,27 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 		link, err := sh.mongoClient.FindOneAndUpdate(CollectionLink, bson.M{
 			"platform": authtype,
 			"uid":      uid,
-			"_ts":      bson.M{"$exists": false},
 		}, bson.M{
 			"$setOnInsert": bson.M{
 				"create": createtime,
 				"email":  email,
 			},
-		}, options.FindOneAndUpdate().SetReturnDocument(options.After).SetUpsert(true).SetProjection(bson.M{"_id": 1}))
+		}, options.FindOneAndUpdate().SetReturnDocument(options.After).SetUpsert(true).SetProjection(bson.M{
+			"_id": 1,
+			"_ts": 1,
+		}))
 		if err != nil {
 			logger.Error("authorize failed :", err)
 			w.WriteHeader(http.StatusInternalServerError)
 			return
 		}
+		delts := link["_ts"].(primitive.Timestamp)
+		if !delts.IsZero() {
+			// 삭제된 계정. 삭제 되었다고 알려주자
+			w.Header().Add("MG-ACCOUNT-DELETED", "TRUE")
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
 
 		linkid := link["_id"].(primitive.ObjectID)
 		newaccid := primitive.NewObjectID()
@@ -825,6 +834,7 @@ func (sh *serviceDescription) delacc(w http.ResponseWriter, r *http.Request) {
 	sType := queryvals.Get("stype")
 	sId := queryvals.Get("sid")
 	sk := queryvals.Get("sk")
+	cancel := queryvals.Has("cancel")
 
 	authInfo := sh.auths.Find(sk)
 	if authInfo == nil {
@@ -857,20 +867,25 @@ func (sh *serviceDescription) delacc(w http.ResponseWriter, r *http.Request) {
 	}
 
 	delfilter := primitive.M{"_id": bson.M{"$in": addIdFilter}}
-	curtime := primitive.NewDateTimeFromTime(time.Now().UTC())
-	updated, _, err := sh.mongoClient.Update(CollectionAccount, delfilter, bson.M{
-		"$set": bson.M{"_ts": curtime},
-	}, options.Update().SetUpsert(false))
-
+	var delop primitive.M
+	if !cancel {
+		curtime := primitive.NewDateTimeFromTime(time.Now().UTC())
+		delop = primitive.M{
+			"$set": primitive.M{"_ts": curtime},
+		}
+	} else {
+		delop = primitive.M{
+			"$unset": primitive.M{"_ts": true},
+		}
+	}
+	updated, _, err := sh.mongoClient.Update(CollectionAccount, delfilter, delop, options.Update().SetUpsert(false))
 	if !updated || err != nil {
 		logger.Error("delacc failed. Update CollectionAccount timestamp err :", err)
 		w.WriteHeader(http.StatusInternalServerError)
 		return
 	}
 
-	updated, _, err = sh.mongoClient.Update(CollectionLink, delfilter, bson.M{
-		"$set": bson.M{"_ts": curtime},
-	}, options.Update().SetUpsert(false))
+	updated, _, err = sh.mongoClient.Update(CollectionLink, delfilter, delop, options.Update().SetUpsert(false))
 	if !updated || err != nil {
 		logger.Error("delacc failed. Update CollectionLink timestamp err :", err)
 		w.WriteHeader(http.StatusInternalServerError)