diff --git a/core/group.go b/core/group.go
index f5c3119..a82550a 100644
--- a/core/group.go
+++ b/core/group.go
@@ -39,4 +39,5 @@ type group interface {
 	Dismiss(groupID primitive.ObjectID) error
 	UpdateGroupDocument(groupID primitive.ObjectID, doc bson.M) error
 	QueryGroupMembers(groupID primitive.ObjectID) (bson.M, error)
+	MemberDisconnected(room string, mid primitive.ObjectID)
 }
diff --git a/core/group_memory.go b/core/group_memory.go
index dc60261..4a08dd8 100644
--- a/core/group_memory.go
+++ b/core/group_memory.go
@@ -523,6 +523,21 @@ func (gm *groupInMemory) UpdateGroupDocument(gid groupID, frag bson.M) error {
 	return nil
 }
 
+func (gm *groupInMemory) MemberDisconnected(room string, mid primitive.ObjectID) {
+	midstr := mid.Hex()
+	deleted, _ := gm.rh.JSONDel(room, "$._members."+midstr)
+	if deleted > 0 {
+		// 퇴장을 알림
+		gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
+			Target: "#" + room,
+			Body: bson.M{
+				midstr: bson.M{},
+			},
+			Tag: []string{"MemberDocFull"},
+		})
+	}
+}
+
 func (cfg *groupConfig) prepareInMemory(ctx context.Context, typename string, sub *subTavern) (group, error) {
 	// group document
 	// member document
diff --git a/core/tavern.go b/core/tavern.go
index e8ebf2b..18b8b1a 100644
--- a/core/tavern.go
+++ b/core/tavern.go
@@ -217,6 +217,15 @@ func (sub *subTavern) OnClientMessageReceived(sender *wshandler.Sender, messageT
 	if messageType == wshandler.Connected {
 		logger.Println("OnClientMessageReceived : connected ", sender.Accid.Hex())
 	} else if messageType == wshandler.Disconnected {
+		var rooms []string
+		dec := json.NewDecoder(body)
+		if err := dec.Decode(&rooms); err == nil {
+			for _, roomname := range rooms {
+				for _, gt := range sub.groups {
+					gt.MemberDisconnected(roomname, sender.Accid)
+				}
+			}
+		}
 		logger.Println("OnClientMessageReceived : disconnected ", sender.Accid.Hex())
 	} else if messageType == wshandler.BinaryMessage {
 		var msg map[string][]any
diff --git a/go.mod b/go.mod
index aa8fe5f..3d26a50 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/go-redis/redis/v8 v8.11.5
 	go.mongodb.org/mongo-driver v1.11.7
-	repositories.action2quare.com/ayo/gocommon v0.0.0-20230719003525-e0e911f9e7da
+	repositories.action2quare.com/ayo/gocommon v0.0.0-20230719073844-112e037f4d4e
 )
 
 require (
diff --git a/go.sum b/go.sum
index 88ffa21..596dff2 100644
--- a/go.sum
+++ b/go.sum
@@ -134,3 +134,5 @@ repositories.action2quare.com/ayo/gocommon v0.0.0-20230719003337-29b2f258507d h1
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230719003337-29b2f258507d/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230719003525-e0e911f9e7da h1:aXkXUzD06heQQhbvLZurzo+QBDYQrXKjmoLsnv3IV/g=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230719003525-e0e911f9e7da/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230719073844-112e037f4d4e h1:WoQVMfkti9XZesqlZfU0Lh7Luib4Y7pOKU2YExNvfmo=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230719073844-112e037f4d4e/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=