diff --git a/core/group_memory.go b/core/group_memory.go
index 5da87ab..3fd009c 100644
--- a/core/group_memory.go
+++ b/core/group_memory.go
@@ -10,7 +10,6 @@ import (
 	"fmt"
 	"net/url"
 	"os"
-	"reflect"
 	"strings"
 	"sync"
 	"time"
@@ -93,7 +92,7 @@ func (gd *groupDoc) updateBodyWithBson(src []byte) ([]byte, error) {
 	return bson.Marshal(gd.Body)
 }
 
-func (gd *groupDoc) updateBodyWithJson(src []byte) []byte {
+func (gd *groupDoc) updateBodyWithJson(src []byte) GroupDocBody {
 	gd.Lock()
 	defer gd.Unlock()
 
@@ -102,10 +101,10 @@ func (gd *groupDoc) updateBodyWithJson(src []byte) []byte {
 		return nil
 	}
 
-	return makeTypeMessage(gd.Body)
+	return gd.Body
 }
 
-func (gd *groupDoc) updateBodyBsonToJson(bsonSrc []byte) []byte {
+func (gd *groupDoc) updateBodyBsonToJson(bsonSrc []byte) GroupDocBody {
 	gd.Lock()
 	defer gd.Unlock()
 
@@ -114,7 +113,7 @@ func (gd *groupDoc) updateBodyBsonToJson(bsonSrc []byte) []byte {
 		return nil
 	}
 
-	return makeTypeMessage(gd.Body)
+	return gd.Body
 }
 
 func (gd *groupDoc) updateBody(bsonSrc []byte) error {
@@ -378,7 +377,7 @@ func (gd *groupDoc) iterateMembers(cb func(ticketID, *memberDoc)) {
 	}
 }
 
-func (gd *groupDoc) serializeFull(gid groupID) []byte {
+func (gd *groupDoc) serializeFull(gid groupID) FullGroupDoc {
 	gd.Lock()
 	defer gd.Unlock()
 
@@ -395,11 +394,11 @@ func (gd *groupDoc) serializeFull(gid groupID) []byte {
 		})
 	}
 
-	return makeTypeMessage(FullGroupDoc{
+	return FullGroupDoc{
 		Gid:        gid,
 		AllMembers: output,
 		Body:       gd.Body,
-	})
+	}
 }
 
 type groupContainer struct {
@@ -498,13 +497,6 @@ func (gm *groupInMemory) FindTicketID(gid groupID, mid groupID) ticketID {
 	return primitive.NilObjectID
 }
 
-func makeTypeMessage[T any](msg T) []byte {
-	var ptr *T
-	name := reflect.TypeOf(ptr).Elem().Name()
-	bt, _ := json.Marshal(bson.M{name: msg})
-	return bt
-}
-
 // func sendTypedMessageDirect[T any](rconn *wshandler.Richconn, msg T) {
 // 	bt, _ := json.Marshal(makeTypeMessage(msg))
 // 	rconn.WriteBytes(bt)
@@ -559,7 +551,8 @@ func (gm *groupInMemory) InviteImplement(gid groupID, mid accountID, inviteeDoc
 		// inviter한테 알려줘야 한다.
 		gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 			Target: "@" + mid.Hex(),
-			Body:   makeTypeMessage(InvitationFail(inviteeDoc)),
+			Body:   inviteeDoc,
+			Tag:    []string{"InvitationFail"},
 		})
 		return nil
 	}
@@ -577,12 +570,13 @@ func (gm *groupInMemory) InviteImplement(gid groupID, mid accountID, inviteeDoc
 	gm.memberSync(gid, targetid, tid, newdoc, false)
 	gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 		Target: "@" + targetid.Hex(),
-		Body: makeTypeMessage(Invitation{
+		Body: Invitation{
 			GroupID:     gid,
 			TicketID:    tid,
 			Inviter:     inviterDoc,
 			ExpireAtUTC: newdoc.InviteExpire.Unix(),
-		}),
+		},
+		Tag: []string{"Invitation"},
 	})
 
 	return nil
@@ -855,7 +849,8 @@ func (gm *groupInMemory) Leave(gid groupID, mid accountID, tid ticketID) error {
 	// 나한테는 빈 FullGroupDoc을 보낸다.
 	gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 		Target: "@" + mid.Hex(),
-		Body:   makeTypeMessage(FullGroupDoc{Gid: gid}),
+		Body:   FullGroupDoc{Gid: gid},
+		Tag:    []string{"FullGroupDoc", gid.Hex()},
 	})
 	gm.sendLeaveRoomMessage(gid, targetmid)
 
@@ -875,6 +870,7 @@ func (gm *groupInMemory) UpdateMemberDocument(gid groupID, mid accountID, doc bs
 	gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 		Target: "#" + gid.Hex(),
 		Body:   gd.updateBodyWithJson(personalized),
+		Tag:    []string{"GroupDocBody"},
 	})
 
 	return nil
@@ -1015,16 +1011,17 @@ func (cfg *groupConfig) prepareInMemory(ctx context.Context, typename string, su
 					if len(remain) == 0 {
 						// gid 그룹 삭제
 						// 그룹 안에 있는 멤버에게 알림
-						bt := makeTypeMessage(FullGroupDoc{Gid: gid})
 						gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 							Target: "#" + gid.Hex(),
-							Body:   bt,
+							Body:   FullGroupDoc{Gid: gid},
+							Tag:    []string{"FullGroupDoc"},
 						})
 						gm.groups.delete(gid)
 					} else if string(senderHost) != config.macAddr {
 						gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 							Target: "#" + gid.Hex(),
 							Body:   gd.updateBodyBsonToJson(remain),
+							Tag:    []string{"GroupDocBody"},
 						})
 					}
 				} else if string(senderHost) != config.macAddr {
@@ -1090,7 +1087,8 @@ func (cfg *groupConfig) prepareInMemory(ctx context.Context, typename string, su
 					}
 					gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 						Target: "#" + gid.Hex(),
-						Body:   makeTypeMessage(PublicMemberDoc{Tid: tid}),
+						Body:   PublicMemberDoc{Tid: tid},
+						Tag:    []string{"PublicMemberDoc"},
 					})
 				} else {
 					if isNewMember && updated.rconn == nil && rconn != nil {
@@ -1099,10 +1097,11 @@ func (cfg *groupConfig) prepareInMemory(ctx context.Context, typename string, su
 					// 업데이트 된 플레이어(새로 들어온 플레이어 포함)를 모두에게 알려준다. 본인 포함, invitee 제외
 					gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 						Target: "#" + gid.Hex(),
-						Body: makeTypeMessage(PublicMemberDoc{
+						Body: PublicMemberDoc{
 							Tid:             tid,
 							memberDocCommon: updated.memberDocCommon,
-						}),
+						},
+						Tag: []string{"PublicMemberDoc"},
 					})
 				}
 
@@ -1113,6 +1112,7 @@ func (cfg *groupConfig) prepareInMemory(ctx context.Context, typename string, su
 						gm.sendUpstreamMessage(&wshandler.UpstreamMessage{
 							Target: "@" + mid.Hex(),
 							Body:   gd.serializeFull(gid),
+							Tag:    []string{"FullGroupDoc"},
 						})
 					}
 				}
diff --git a/go.mod b/go.mod
index 5a5cc28..85d88e6 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.19
 require (
 	github.com/go-redis/redis/v8 v8.11.5
 	go.mongodb.org/mongo-driver v1.11.7
-	repositories.action2quare.com/ayo/gocommon v0.0.0-20230711033135-d7b26608df94
+	repositories.action2quare.com/ayo/gocommon v0.0.0-20230711053010-4acb81a20d9c
 )
 
 require (
diff --git a/go.sum b/go.sum
index 50ed0b8..ddd9add 100644
--- a/go.sum
+++ b/go.sum
@@ -110,3 +110,7 @@ repositories.action2quare.com/ayo/gocommon v0.0.0-20230711005604-a42eb2888e97 h1
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230711005604-a42eb2888e97/go.mod h1:ng62uGMGXyQSeuxePG5gJAMtip4Rnspu5Tu7hgvaXns=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230711033135-d7b26608df94 h1:VrNj5gBFFN9/roWCxyBCZ2gu5k58eremNHQvQNPrfrU=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230711033135-d7b26608df94/go.mod h1:ng62uGMGXyQSeuxePG5gJAMtip4Rnspu5Tu7hgvaXns=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230711035757-9fd0dd00cb7d h1:RdxKmMc7kHrTk+SvTYse2IGxmdDhbEDeM0fKAUW+G+w=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230711035757-9fd0dd00cb7d/go.mod h1:ng62uGMGXyQSeuxePG5gJAMtip4Rnspu5Tu7hgvaXns=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230711053010-4acb81a20d9c h1:SktFqjnc/UOMjJrq/brSw5lQjW1IA+KkB5YgeovusmQ=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230711053010-4acb81a20d9c/go.mod h1:ng62uGMGXyQSeuxePG5gJAMtip4Rnspu5Tu7hgvaXns=