diff --git a/rpc/rpc.go b/rpc/rpc.go
new file mode 100644
index 0000000..3bcff82
--- /dev/null
+++ b/rpc/rpc.go
@@ -0,0 +1,217 @@
+package rpc
+
+import (
+	"bytes"
+	"context"
+	"crypto/md5"
+	"encoding/gob"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"path"
+	"reflect"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/go-redis/redis/v8"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"repositories.action2quare.com/ayo/gocommon/logger"
+)
+
+type Receiver interface {
+	TargetExists(primitive.ObjectID) bool
+}
+
+type receiverManifest struct {
+	r       Receiver
+	methods map[string]reflect.Method
+}
+
+type rpcEngine struct {
+	receivers map[string]receiverManifest
+	publish   func([]byte) error
+}
+
+var engine = rpcEngine{
+	receivers: make(map[string]receiverManifest),
+}
+
+func RegistReceiver(ptr Receiver) {
+	rname := reflect.TypeOf(ptr).Elem().Name()
+	rname = fmt.Sprintf("(*%s)", rname)
+
+	methods := make(map[string]reflect.Method)
+	for i := 0; i < reflect.TypeOf(ptr).NumMethod(); i++ {
+		method := reflect.TypeOf(ptr).Method(i)
+		methods[method.Name] = method
+	}
+	engine.receivers[rname] = receiverManifest{
+		r:       ptr,
+		methods: methods,
+	}
+}
+
+func Start(ctx context.Context, redisClient *redis.Client) {
+	if engine.publish != nil {
+		return
+	}
+
+	hash := md5.New()
+	for k, manifest := range engine.receivers {
+		hash.Write([]byte(k))
+		for m, r := range manifest.methods {
+			hash.Write([]byte(m))
+			hash.Write([]byte(r.Name))
+			for i := 0; i < r.Type.NumIn(); i++ {
+				inName := r.Type.In(i).Name()
+				hash.Write([]byte(inName))
+			}
+		}
+	}
+
+	pubsubName := hex.EncodeToString(hash.Sum(nil))[:16]
+
+	engine.publish = func(s []byte) error {
+		_, err := redisClient.Publish(ctx, pubsubName, s).Result()
+		return err
+	}
+
+	go engine.loop(ctx, redisClient, pubsubName)
+}
+
+func (re *rpcEngine) callFromMessage(msg *redis.Message) {
+	defer func() {
+		r := recover()
+		if r != nil {
+			logger.Error(r)
+		}
+	}()
+
+	encoded := []byte(msg.Payload)
+	var target primitive.ObjectID
+	copy(target[:], encoded[:12])
+
+	encoded = encoded[12:]
+	for i, c := range encoded {
+		if c == ')' {
+			if manifest, ok := re.receivers[string(encoded[:i+1])]; ok {
+				// 리시버 찾음
+				if manifest.r.TargetExists(target) {
+					// 이 리시버가 타겟을 가지고 있음
+					encoded = encoded[i+1:]
+					decoder := gob.NewDecoder(bytes.NewBuffer(encoded))
+					var params []any
+					if decoder.Decode(&params) == nil {
+						method := manifest.methods[params[0].(string)]
+						args := []reflect.Value{
+							reflect.ValueOf(manifest.r),
+						}
+						for _, arg := range params[1:] {
+							args = append(args, reflect.ValueOf(arg))
+						}
+						method.Func.Call(args)
+					}
+				}
+			}
+		}
+	}
+}
+
+func (re *rpcEngine) loop(ctx context.Context, redisClient *redis.Client, chanName string) {
+	defer func() {
+		r := recover()
+		if r != nil {
+			logger.Error(r)
+		}
+	}()
+
+	pubsub := redisClient.Subscribe(ctx, chanName)
+	for {
+		if ctx.Err() != nil {
+			return
+		}
+
+		if pubsub == nil {
+			pubsub = redisClient.Subscribe(ctx, chanName)
+		}
+
+		msg, err := pubsub.ReceiveMessage(ctx)
+
+		if err != nil {
+			if err == redis.ErrClosed {
+				time.Sleep(time.Second)
+			}
+			pubsub = nil
+		} else {
+			re.callFromMessage(msg)
+		}
+	}
+}
+
+var errNoReceiver = errors.New("no receiver")
+
+type CallContext struct {
+	r Receiver
+	t primitive.ObjectID
+}
+
+var ErrCanExecuteHere = errors.New("go ahead")
+
+func (c *CallContext) Call(args ...any) error {
+	if c.r.TargetExists(c.t) {
+		// 여기 있네?
+		return ErrCanExecuteHere
+	}
+
+	pc := make([]uintptr, 1)
+	n := runtime.Callers(3, pc[:])
+	if n < 1 {
+		return errNoReceiver
+	}
+
+	frame, _ := runtime.CallersFrames(pc).Next()
+	fullname := path.Base(frame.Function)
+	prf := strings.Split(fullname, ".")
+	rname := prf[1]
+	funcname := prf[2]
+
+	serialized, err := encode(c.t, rname, funcname, args...)
+	if err != nil {
+		return err
+	}
+
+	return engine.publish(serialized)
+}
+
+func Make(r Receiver) *CallContext {
+	return &CallContext{
+		r: r,
+	}
+}
+
+func (cc *CallContext) To(target primitive.ObjectID) *CallContext {
+	cc.t = target
+	return cc
+}
+
+func encode(target primitive.ObjectID, receiver string, funcname string, args ...any) ([]byte, error) {
+	buff := new(bytes.Buffer)
+
+	// 타겟을 가장 먼저 기록
+	buff.Write(target[:])
+
+	// receiver
+	buff.Write([]byte(receiver))
+
+	// 다음 call context 기록
+	m := append([]any{funcname}, args...)
+	encoder := gob.NewEncoder(buff)
+	err := encoder.Encode(m)
+	if err != nil {
+		logger.Error("rpcCallContext.send err :", err)
+		return nil, err
+	}
+
+	return buff.Bytes(), nil
+}
diff --git a/rpc/rpc_test.go b/rpc/rpc_test.go
new file mode 100644
index 0000000..ccc3071
--- /dev/null
+++ b/rpc/rpc_test.go
@@ -0,0 +1,48 @@
+package rpc
+
+import (
+	"context"
+	"math/rand"
+	"testing"
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"repositories.action2quare.com/ayo/gocommon"
+	"repositories.action2quare.com/ayo/gocommon/logger"
+)
+
+type testReceiver struct {
+}
+
+func (tr *testReceiver) TargetExists(tid primitive.ObjectID) bool {
+	logger.Println(tid.Hex())
+	return tid[0] >= 10
+}
+
+func (tr *testReceiver) TestFunc(a string, b string, c int) {
+	target := primitive.NewObjectID()
+	target[0] = byte(rand.Intn(2) * 20)
+	if Make(tr).To(target).Call(a, b, c) != ErrCanExecuteHere {
+		return
+	}
+
+	logger.Println("    ", a, b, target[0])
+}
+
+func TestRpc(t *testing.T) {
+	var tr testReceiver
+	RegistReceiver(&tr)
+	myctx, cancel := context.WithCancel(context.Background())
+
+	redisClient, _ := gocommon.NewRedisClient("redis://192.168.8.94:6379", 0)
+	go func() {
+		for {
+			tr.TestFunc("aaaa", "bbbb", 333)
+			time.Sleep(time.Second)
+		}
+	}()
+
+	Start(myctx, redisClient)
+	<-myctx.Done()
+	cancel()
+}
diff --git a/wshandler/room.go b/wshandler/room.go
new file mode 100644
index 0000000..762e165
--- /dev/null
+++ b/wshandler/room.go
@@ -0,0 +1,85 @@
+package wshandler
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/gorilla/websocket"
+	"repositories.action2quare.com/ayo/gocommon/logger"
+)
+
+type room struct {
+	inChan      chan *wsconn
+	outChan     chan *wsconn
+	messageChan chan *UpstreamMessage
+	name        string
+}
+
+func makeRoom(name string) *room {
+	return &room{
+		inChan:      make(chan *wsconn, 10),
+		outChan:     make(chan *wsconn, 10),
+		messageChan: make(chan *UpstreamMessage, 100),
+		name:        name,
+	}
+}
+
+func (r *room) broadcast(msg *UpstreamMessage) {
+	r.messageChan <- msg
+}
+
+func (r *room) in(conn *wsconn) {
+	r.inChan <- conn
+}
+
+func (r *room) out(conn *wsconn) {
+	r.outChan <- conn
+}
+
+func (r *room) start(ctx context.Context) {
+	go func(ctx context.Context) {
+		conns := make(map[string]*wsconn)
+		normal := false
+		for !normal {
+			normal = r.loop(ctx, &conns)
+		}
+	}(ctx)
+}
+
+func (r *room) loop(ctx context.Context, conns *map[string]*wsconn) (normalEnd bool) {
+	defer func() {
+		s := recover()
+		if s != nil {
+			logger.Error(s)
+			normalEnd = false
+		}
+	}()
+
+	tag := "#" + r.name
+	for {
+		select {
+		case <-ctx.Done():
+			return true
+
+		case conn := <-r.inChan:
+			(*conns)[conn.sender.Accid.Hex()] = conn
+
+		case conn := <-r.outChan:
+			delete((*conns), conn.sender.Accid.Hex())
+
+		case msg := <-r.messageChan:
+			ds := DownstreamMessage{
+				Alias: msg.Alias,
+				Body:  msg.Body,
+				Tag:   append(msg.Tag, tag),
+			}
+			bt, _ := json.Marshal(ds)
+
+			for _, conn := range *conns {
+				writer, _ := conn.NextWriter(websocket.TextMessage)
+				writer.Write(bt)
+				writer.Close()
+			}
+		}
+	}
+}
diff --git a/wshandler/wshandler.go b/wshandler/wshandler.go
index 0ad7fb0..e4427c0 100644
--- a/wshandler/wshandler.go
+++ b/wshandler/wshandler.go
@@ -7,505 +7,460 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"os"
 	"strings"
 	"sync"
+	"time"
 
-	common "repositories.action2quare.com/ayo/gocommon"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+	"repositories.action2quare.com/ayo/gocommon"
 	"repositories.action2quare.com/ayo/gocommon/flagx"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 
 	"github.com/go-redis/redis/v8"
 	"github.com/gorilla/websocket"
-	"go.mongodb.org/mongo-driver/bson"
-	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
 var noSessionFlag = flagx.Bool("nosession", false, "nosession=[true|false]")
 
+type wsconn struct {
+	*websocket.Conn
+	sender *Sender
+}
+
+type UpstreamMessage struct {
+	Alias  string
+	Accid  primitive.ObjectID
+	Target string
+	Body   any
+	Tag    []string
+}
+
+type DownstreamMessage struct {
+	Alias string   `json:",omitempty"`
+	Body  any      `json:",omitempty"`
+	Tag   []string `json:",omitempty"`
+}
+
+type commandType string
+
 const (
-	connStateCachePrefix = "conn_state_"
-	connStateScript      = `
-		local hosts = redis.call('keys',KEYS[1]) 
-		for index, key in ipairs(hosts) do
- 			local ok = redis.call('hexists', key, KEYS[2])
-			if ok == 1 then
-				return redis.call('hget', key, KEYS[2])
-			end
-		end
-		return ""
-	`
+	commandType_JoinRoom     = commandType("join_room")
+	commandType_LeaveRoom    = commandType("leave_room")
+	commandType_WriteControl = commandType("write_control")
 )
 
-var ConnStateCacheKey = func() string {
-	hn, _ := os.Hostname()
-	return connStateCachePrefix + hn
-}()
-
-type Richconn struct {
-	*websocket.Conn
-	lock    sync.Mutex
-	alias   primitive.ObjectID
-	tags    []string
-	onClose map[string]func()
+type commandMessage struct {
+	Cmd  commandType
+	Args []any
 }
 
-func (rc *Richconn) AddTag(name, val string) {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
+type WebSocketMessageType int
 
-	prefix := name + "="
-	for i, tag := range rc.tags {
-		if strings.HasPrefix(tag, prefix) {
-			rc.tags[i] = prefix + val
-			return
-		}
-	}
-	rc.tags = append(rc.tags, prefix+val)
+const (
+	TextMessage   = WebSocketMessageType(websocket.TextMessage)
+	BinaryMessage = WebSocketMessageType(websocket.BinaryMessage)
+	CloseMessage  = WebSocketMessageType(websocket.CloseMessage)
+	PingMessage   = WebSocketMessageType(websocket.PingMessage)
+	PongMessage   = WebSocketMessageType(websocket.PongMessage)
+	Connected     = WebSocketMessageType(100)
+	Disconnected  = WebSocketMessageType(101)
+)
+
+type Sender struct {
+	Region string
+	Accid  primitive.ObjectID
+	Alias  string
 }
 
-func (rc *Richconn) GetTag(name string) string {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-
-	prefix := name + "="
-	for _, tag := range rc.tags {
-		if strings.HasPrefix(tag, prefix) {
-			return tag[len(prefix):]
-		}
-	}
-	return ""
-}
-
-func (rc *Richconn) RemoveTag(name string, val string) {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-
-	whole := fmt.Sprintf("%s=%s", name, val)
-	for i, tag := range rc.tags {
-		if tag == whole {
-			if i == 0 && len(rc.tags) == 1 {
-				rc.tags = nil
-			} else {
-				lastidx := len(rc.tags) - 1
-				if i < lastidx {
-					rc.tags[i] = rc.tags[lastidx]
-				}
-				rc.tags = rc.tags[:lastidx]
-			}
-			return
-		}
-	}
-}
-
-func (rc *Richconn) RegistOnCloseFunc(name string, f func()) {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-
-	if rc.onClose == nil {
-		f()
-		return
-	}
-	rc.onClose[name] = f
-}
-
-func (rc *Richconn) HasOnCloseFunc(name string) bool {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-
-	if rc.onClose == nil {
-		return false
-	}
-
-	_, ok := rc.onClose[name]
-	return ok
-}
-
-func (rc *Richconn) UnregistOnCloseFunc(name string) (out func()) {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-
-	if rc.onClose == nil {
-		return
-	}
-	out = rc.onClose[name]
-	delete(rc.onClose, name)
-	return
-}
-
-func (rc *Richconn) WriteBytes(data []byte) error {
-	rc.lock.Lock()
-	defer rc.lock.Unlock()
-	return rc.WriteMessage(websocket.TextMessage, data)
-}
-
-type DeliveryMessage struct {
-	Alias   primitive.ObjectID
-	Body    []byte
-	Command string
-	Conn    *Richconn
-}
-
-func (dm *DeliveryMessage) Parse(out any) error {
-	return json.Unmarshal(dm.Body, out)
-}
-
-func (dm *DeliveryMessage) MarshalBinary() (data []byte, err error) {
-	return append(dm.Alias[:], dm.Body...), nil
-}
-
-func (dm *DeliveryMessage) UnmarshalBinary(data []byte) error {
-	copy(dm.Alias[:], data[:12])
-	dm.Body = data[12:]
-	return nil
-}
-
-type tagconn struct {
-	rc    *Richconn
-	state string
-}
-type tagconnsmap = map[primitive.ObjectID]*tagconn
-type tagconns struct {
-	sync.Mutex
-	tagconnsmap
-}
+type WebSocketMessageReceiver func(sender *Sender, messageType WebSocketMessageType, body io.Reader)
 
 type subhandler struct {
-	sync.Mutex
-	authCache    *common.AuthCollection
-	conns        map[primitive.ObjectID]*Richconn
-	aliases      map[primitive.ObjectID]primitive.ObjectID
-	tags         map[primitive.ObjectID]*tagconns
-	deliveryChan chan DeliveryMessage
-	url          string
-	redisSync    *redis.Client
+	authCache         *gocommon.AuthCollection
+	redisMsgChanName  string
+	redisCmdChanName  string
+	redisSync         *redis.Client
+	connInOutChan     chan *wsconn
+	deliveryChan      chan any
+	localDeliveryChan chan any
+	callReceiver      WebSocketMessageReceiver
+	connWaitGroup     sync.WaitGroup
+	region            string
 }
 
 // WebsocketHandler  :
 type WebsocketHandler struct {
-	authCaches map[string]*subhandler
-	RedisSync  *redis.Client
+	authCaches    map[string]*subhandler
+	RedisSync     *redis.Client
+	receiverChain map[string][]WebSocketMessageReceiver
 }
 
 type wsConfig struct {
 	SyncPipeline string `json:"ws_sync_pipeline"`
 }
 
-func NewWebsocketHandler(authglobal common.AuthCollectionGlobal) (wsh *WebsocketHandler) {
+func NewWebsocketHandler(authglobal gocommon.AuthCollectionGlobal) (wsh *WebsocketHandler) {
+	var config wsConfig
+	gocommon.LoadConfig(&config)
+
+	redisSync, err := gocommon.NewRedisClient(config.SyncPipeline, 0)
+	if err != nil {
+		panic(err)
+	}
+
+	// decoder := func(r io.Reader) *T {
+	// 	if r == nil {
+	// 		// 접속이 끊겼을 때.
+	// 		return nil
+	// 	}
+	// 	var m T
+	// 	dec := json.NewDecoder(r)
+	// 	if err := dec.Decode(&m); err != nil {
+	// 		logger.Println(err)
+	// 	}
+
+	// 	// decoding 실패하더라도 빈 *T를 내보냄
+	// 	return &m
+	// }
+
 	authCaches := make(map[string]*subhandler)
 	for _, region := range authglobal.Regions() {
 		sh := &subhandler{
-			authCache:    authglobal.Get(region),
-			conns:        make(map[primitive.ObjectID]*Richconn),
-			aliases:      make(map[primitive.ObjectID]primitive.ObjectID),
-			tags:         make(map[primitive.ObjectID]*tagconns),
-			deliveryChan: make(chan DeliveryMessage, 1000),
+			authCache:         authglobal.Get(region),
+			redisMsgChanName:  fmt.Sprintf("_wsh_msg_%s", region),
+			redisCmdChanName:  fmt.Sprintf("_wsh_cmd_%s", region),
+			redisSync:         redisSync,
+			connInOutChan:     make(chan *wsconn),
+			deliveryChan:      make(chan any, 1000),
+			localDeliveryChan: make(chan any, 100),
+			region:            region,
 		}
 
 		authCaches[region] = sh
 	}
 
-	var config wsConfig
-	common.LoadConfig(&config)
-
-	redisSync, err := common.NewRedisClient(config.SyncPipeline, 0)
-	if err != nil {
-		panic(err)
-	}
-
 	return &WebsocketHandler{
-		authCaches: authCaches,
-		RedisSync:  redisSync,
+		authCaches:    authCaches,
+		RedisSync:     redisSync,
+		receiverChain: make(map[string][]WebSocketMessageReceiver),
 	}
 }
 
-func (ws *WebsocketHandler) Destructor() {
-	if ws.RedisSync != nil {
-		ws.RedisSync.Del(context.Background(), ConnStateCacheKey)
-	}
+func (ws *WebsocketHandler) RegisterReceiver(region string, receiver WebSocketMessageReceiver) {
+	ws.receiverChain[region] = append(ws.receiverChain[region], receiver)
 }
 
-func (ws *WebsocketHandler) DeliveryChannel(region string) <-chan DeliveryMessage {
-	return ws.authCaches[region].deliveryChan
-}
-
-func (ws *WebsocketHandler) Conn(region string, alias primitive.ObjectID) *Richconn {
-	if sh := ws.authCaches[region]; sh != nil {
-		return sh.conns[alias]
-	}
-	return nil
-}
-
-func (ws *WebsocketHandler) JoinTag(region string, tag primitive.ObjectID, tid primitive.ObjectID, rc *Richconn, hint string) error {
-	if sh := ws.authCaches[region]; sh != nil {
-		sh.joinTag(tag, tid, rc, hint)
-	}
-	return nil
-}
-
-func (ws *WebsocketHandler) LeaveTag(region string, tag primitive.ObjectID, tid primitive.ObjectID) error {
-	if sh := ws.authCaches[region]; sh != nil {
-		sh.leaveTag(tag, tid)
-	}
-	return nil
-}
-
-func (ws *WebsocketHandler) SetStateInTag(region string, tag primitive.ObjectID, tid primitive.ObjectID, state string, hint string) error {
-	if sh := ws.authCaches[region]; sh != nil {
-		sh.setStateInTag(tag, tid, state, hint)
-	}
-	return nil
-}
-
-func (ws *WebsocketHandler) BroadcastRaw(region string, tag primitive.ObjectID, raw []byte) {
-	if sh := ws.authCaches[region]; sh != nil {
-		if cs := sh.cloneTag(tag); len(cs) > 0 {
-			go func(raw []byte) {
-				for _, c := range cs {
-					if c != nil {
-						c.WriteBytes(raw)
-					}
+func (ws *WebsocketHandler) Start(ctx context.Context) {
+	for region, sh := range ws.authCaches {
+		chain := ws.receiverChain[region]
+		if len(chain) == 0 {
+			sh.callReceiver = func(sender *Sender, messageType WebSocketMessageType, body io.Reader) {}
+		} else if len(chain) == 1 {
+			sh.callReceiver = chain[0]
+		} else {
+			sh.callReceiver = func(sender *Sender, messageType WebSocketMessageType, body io.Reader) {
+				for _, r := range chain {
+					r(sender, messageType, body)
 				}
-			}(raw)
+			}
 		}
+
+		go sh.mainLoop(ctx)
 	}
 }
 
-func (ws *WebsocketHandler) Broadcast(region string, tag primitive.ObjectID, doc bson.M) {
-	raw, _ := json.Marshal(doc)
-	ws.BroadcastRaw(region, tag, raw)
+func (ws *WebsocketHandler) Cleanup() {
+	for _, sh := range ws.authCaches {
+		sh.connWaitGroup.Wait()
+	}
 }
 
-var onlineQueryScriptHash string
-
-func (ws *WebsocketHandler) RegisterHandlers(ctx context.Context, serveMux *http.ServeMux, prefix string) error {
-	ws.RedisSync.Del(context.Background(), ConnStateCacheKey)
-
-	scriptHash, err := ws.RedisSync.ScriptLoad(context.Background(), connStateScript).Result()
-	if err != nil {
-		return err
-	}
-	onlineQueryScriptHash = scriptHash
+func (ws *WebsocketHandler) RegisterHandlers(serveMux *http.ServeMux, prefix string) error {
 	for region, sh := range ws.authCaches {
 		if region == "default" {
 			region = ""
 		}
-		sh.url = common.MakeHttpHandlerPattern(prefix, region, "ws")
-		sh.redisSync = ws.RedisSync
+		url := gocommon.MakeHttpHandlerPattern(prefix, region, "ws")
 		if *noSessionFlag {
-			serveMux.HandleFunc(sh.url, sh.upgrade_nosession)
+			serveMux.HandleFunc(url, sh.upgrade_nosession)
 		} else {
-			serveMux.HandleFunc(sh.url, sh.upgrade)
+			serveMux.HandleFunc(url, sh.upgrade)
 		}
 	}
 
 	return nil
 }
 
-func (sh *subhandler) cloneTag(tag primitive.ObjectID) (out []*Richconn) {
-	sh.Lock()
-	cs := sh.tags[tag]
-	sh.Unlock()
-
-	if cs == nil {
-		return nil
+func (ws *WebsocketHandler) GetState(region string, accid primitive.ObjectID) string {
+	state, err := ws.RedisSync.Get(context.Background(), accid.Hex()).Result()
+	if err == redis.Nil {
+		return ""
 	}
-
-	cs.Lock()
-	defer cs.Unlock()
-
-	out = make([]*Richconn, 0, len(cs.tagconnsmap))
-	for _, c := range cs.tagconnsmap {
-		out = append(out, c.rc)
-	}
-	return
+	return state
 }
 
-func (sh *subhandler) joinTag(tag primitive.ObjectID, tid primitive.ObjectID, rc *Richconn, hint string) {
-	sh.Lock()
-	cs := sh.tags[tag]
-	if cs == nil {
-		cs = &tagconns{
-			tagconnsmap: make(map[primitive.ObjectID]*tagconn),
-		}
-	}
-	sh.Unlock()
+func (ws *WebsocketHandler) SetState(region string, accid primitive.ObjectID, state string) {
+	ws.RedisSync.SetArgs(context.Background(), accid.Hex(), state, redis.SetArgs{Mode: "XX"}).Result()
+}
 
-	cs.Lock()
-	states := make([]bson.M, 0, len(cs.tagconnsmap))
-	for tid, conn := range cs.tagconnsmap {
-		states = append(states, bson.M{
-			"_id":   tid,
-			"_hint": hint,
-			"state": conn.state,
-		})
-	}
-
-	cs.tagconnsmap[tid] = &tagconn{rc: rc}
-	cs.Unlock()
-
-	sh.Lock()
-	sh.tags[tag] = cs
-	sh.Unlock()
-
-	if len(states) > 0 {
-		s, _ := json.Marshal(states)
-		rc.WriteBytes(s)
+func (ws *WebsocketHandler) SendUpstreamMessage(region string, msg *UpstreamMessage) {
+	sh := ws.authCaches[region]
+	if sh != nil {
+		sh.localDeliveryChan <- msg
 	}
 }
 
-func (sh *subhandler) leaveTag(tag primitive.ObjectID, tid primitive.ObjectID) {
-	sh.Lock()
-	defer sh.Unlock()
-
-	cs := sh.tags[tag]
-	if cs == nil {
-		return
-	}
-
-	delete(cs.tagconnsmap, tid)
-	if len(cs.tagconnsmap) == 0 {
-		delete(sh.tags, tag)
-	} else {
-		sh.tags[tag] = cs
-	}
-}
-
-func (sh *subhandler) setStateInTag(tag primitive.ObjectID, tid primitive.ObjectID, state string, hint string) {
-	sh.Lock()
-	cs := sh.tags[tag]
-	sh.Unlock()
-
-	if cs == nil {
-		return
-	}
-
-	cs.Lock()
-	defer cs.Unlock()
-
-	if tagconn := cs.tagconnsmap[tid]; tagconn != nil {
-		tagconn.state = state
-
-		var clone []*Richconn
-		for _, c := range cs.tagconnsmap {
-			clone = append(clone, c.rc)
-		}
-		raw, _ := json.Marshal(map[string]any{
-			"_id":   tid,
-			"_hint": hint,
-			"state": state,
-		})
-		go func(raw []byte) {
-			for _, c := range clone {
-				c.WriteBytes(raw)
-			}
-		}(raw)
-	}
-}
-
-func (wsh *WebsocketHandler) GetState(alias primitive.ObjectID) (string, error) {
-	state, err := wsh.RedisSync.EvalSha(context.Background(), onlineQueryScriptHash, []string{
-		connStateCachePrefix + "*", alias.Hex(),
-	}).Result()
-
-	if err != nil {
-		return "", err
-	}
-
-	return state.(string), nil
-}
-
-func (wsh *WebsocketHandler) IsOnline(alias primitive.ObjectID) (bool, error) {
-	state, err := wsh.GetState(alias)
-	if err != nil {
-		logger.Error("IsOnline failed. err :", err)
-		return false, err
-	}
-	return len(state) > 0, nil
-}
-
-func (sh *subhandler) closeConn(accid primitive.ObjectID) {
-	sh.Lock()
-	defer sh.Unlock()
-
-	if alias, ok := sh.aliases[accid]; ok {
-		if old := sh.conns[alias]; old != nil {
-			old.Close()
+func (ws *WebsocketHandler) SendCloseMessage(region string, target string, text string) {
+	sh := ws.authCaches[region]
+	if sh != nil {
+		sh.localDeliveryChan <- &commandMessage{
+			Cmd: commandType_WriteControl,
+			Args: []any{
+				target,
+				int(websocket.CloseMessage),
+				websocket.FormatCloseMessage(websocket.CloseNormalClosure, text),
+			},
 		}
 	}
 }
 
-func (sh *subhandler) addConn(conn *Richconn, accid primitive.ObjectID) {
-	sh.Lock()
-	defer sh.Unlock()
-
-	sh.conns[conn.alias] = conn
-	sh.aliases[accid] = conn.alias
+func (ws *WebsocketHandler) EnterRoom(region string, room string, accid primitive.ObjectID) {
+	sh := ws.authCaches[region]
+	if sh != nil {
+		sh.localDeliveryChan <- &commandMessage{
+			Cmd:  commandType_JoinRoom,
+			Args: []any{room, accid},
+		}
+	}
 }
 
-func upgrade_core(sh *subhandler, conn *websocket.Conn, initState string, accid primitive.ObjectID, alias primitive.ObjectID) {
-	sh.closeConn(accid)
+func (ws *WebsocketHandler) LeaveRoom(region string, room string, accid primitive.ObjectID) {
+	sh := ws.authCaches[region]
+	if sh != nil {
+		sh.localDeliveryChan <- &commandMessage{
+			Cmd:  commandType_LeaveRoom,
+			Args: []any{room, accid},
+		}
+	}
+}
 
-	newconn := sh.makeRichConn(alias, conn)
-	sh.addConn(newconn, accid)
-	sh.redisSync.HSet(context.Background(), ConnStateCacheKey, alias.Hex(), initState).Result()
+func (sh *subhandler) mainLoop(ctx context.Context) {
+	defer func() {
+		s := recover()
+		if s != nil {
+			logger.Error(s)
+		}
+	}()
 
-	go func(c *Richconn, accid primitive.ObjectID, deliveryChan chan<- DeliveryMessage) {
+	// redis channel에서 유저가 보낸 메시지를 읽는 go rountine
+	go func() {
+		var pubsub *redis.PubSub
 		for {
-			mt, p, err := c.ReadMessage()
+			if pubsub == nil {
+				pubsub = sh.redisSync.Subscribe(ctx, sh.redisMsgChanName, sh.redisCmdChanName)
+			}
 
+			raw, err := pubsub.ReceiveMessage(ctx)
+			if err == nil {
+				if raw.Channel == sh.redisMsgChanName {
+					var msg UpstreamMessage
+					if err := json.Unmarshal([]byte(raw.Payload), &msg); err == nil {
+						sh.deliveryChan <- &msg
+					} else {
+						logger.Println("decode UpstreamMessage failed :", err)
+					}
+				} else if raw.Channel == sh.redisCmdChanName {
+					var cmd commandMessage
+					if err := json.Unmarshal([]byte(raw.Payload), &cmd); err == nil {
+						sh.deliveryChan <- &cmd
+					} else {
+						logger.Println("decode UpstreamMessage failed :", err)
+					}
+				}
+			} else {
+				logger.Println("pubsub.ReceiveMessage failed :", err)
+				pubsub.Close()
+				pubsub = nil
+
+				if ctx.Err() != nil {
+					break
+				}
+			}
+		}
+	}()
+
+	entireConns := make(map[string]*wsconn)
+	rooms := make(map[string]*room)
+	findRoom := func(name string, create bool) *room {
+		room := rooms[name]
+		if room == nil && create {
+			room = makeRoom(name)
+			rooms[name] = room
+			room.start(ctx)
+		}
+		return room
+	}
+
+	// 유저에게서 온 메세지, 소켓 연결/해체 처리
+	for {
+		select {
+		case usermsg := <-sh.localDeliveryChan:
+			// 로컬에 connection이 있는지 먼저 확인해 보기 위한 채널
+			// 없으면 publish한다.
+			switch usermsg := usermsg.(type) {
+			case *UpstreamMessage:
+				target := usermsg.Target
+				if target[0] == '@' {
+					accid := target[1:]
+					conn := entireConns[accid]
+					if conn != nil {
+						// 이 경우 아니면 publish 해야 함
+						ds, _ := json.Marshal(DownstreamMessage{
+							Alias: usermsg.Alias,
+							Body:  usermsg.Body,
+							Tag:   usermsg.Tag,
+						})
+
+						conn.WriteMessage(websocket.TextMessage, ds)
+						break
+					}
+				}
+				if bt, err := json.Marshal(usermsg); err == nil {
+					sh.redisSync.Publish(context.Background(), sh.redisMsgChanName, bt).Result()
+				}
+
+			case *commandMessage:
+				if usermsg.Cmd == commandType_JoinRoom && len(usermsg.Args) == 2 {
+					roomName := usermsg.Args[0].(string)
+					accid := usermsg.Args[1].(primitive.ObjectID)
+					conn := entireConns[accid.Hex()]
+					if conn != nil {
+						findRoom(roomName, true).in(conn)
+						break
+					}
+				} else if usermsg.Cmd == commandType_LeaveRoom && len(usermsg.Args) == 2 {
+					roomName := usermsg.Args[0].(string)
+					accid := usermsg.Args[1].(primitive.ObjectID)
+					conn := entireConns[accid.Hex()]
+					if conn != nil {
+						if room := findRoom(roomName, false); room != nil {
+							room.out(conn)
+							break
+						}
+					}
+				} else if usermsg.Cmd == commandType_WriteControl && len(usermsg.Args) == 2 {
+					accid := usermsg.Args[0].(string)
+					conn := entireConns[accid]
+					if conn != nil {
+						conn.WriteControl(usermsg.Args[1].(int), usermsg.Args[2].([]byte), time.Time{})
+						break
+					}
+				}
+
+				// 위에서 break 안걸리면 나한테 없으므로 publish를 해야 함. 그러면 다른 호스트가 deliveryChan으로 받는다
+				if bt, err := json.Marshal(usermsg); err == nil {
+					sh.redisSync.Publish(context.Background(), sh.redisCmdChanName, bt).Result()
+				}
+			}
+
+		case usermsg := <-sh.deliveryChan:
+			switch usermsg := usermsg.(type) {
+			case *UpstreamMessage:
+				target := usermsg.Target
+				if target[0] == '#' {
+					// 룸에 브로드캐스팅
+					roomName := target[1:]
+					if room := findRoom(roomName, false); room != nil {
+						room.broadcast(usermsg)
+					}
+				} else if target[0] == '@' {
+					accid := target[1:]
+					conn := entireConns[accid]
+					if conn != nil {
+						ds, _ := json.Marshal(DownstreamMessage{
+							Alias: usermsg.Alias,
+							Body:  usermsg.Body,
+							Tag:   usermsg.Tag,
+						})
+						conn.WriteMessage(websocket.TextMessage, ds)
+					}
+				}
+
+			case *commandMessage:
+				if usermsg.Cmd == commandType_JoinRoom && len(usermsg.Args) == 2 {
+					roomName := usermsg.Args[0].(string)
+					accid := usermsg.Args[1].(primitive.ObjectID)
+					conn := entireConns[accid.Hex()]
+					if conn != nil {
+						findRoom(roomName, true).in(conn)
+					}
+				} else if usermsg.Cmd == commandType_LeaveRoom && len(usermsg.Args) == 2 {
+					roomName := usermsg.Args[0].(string)
+					accid := usermsg.Args[1].(primitive.ObjectID)
+					conn := entireConns[accid.Hex()]
+					if conn != nil {
+						if room := findRoom(roomName, false); room != nil {
+							room.out(conn)
+						}
+					}
+				}
+
+			default:
+				logger.Println("usermsg is unknown type")
+			}
+
+		case c := <-sh.connInOutChan:
+			if c.Conn == nil {
+				delete(entireConns, c.sender.Accid.Hex())
+				for _, room := range rooms {
+					room.out(c)
+				}
+				sh.callReceiver(c.sender, Disconnected, nil)
+			} else {
+				entireConns[c.sender.Accid.Hex()] = c
+				sh.callReceiver(c.sender, Connected, nil)
+			}
+		}
+	}
+}
+
+func upgrade_core(sh *subhandler, conn *websocket.Conn, accid primitive.ObjectID, alias string) {
+	newconn := &wsconn{
+		Conn: conn,
+		sender: &Sender{
+			Region: sh.region,
+			Alias:  alias,
+			Accid:  accid,
+		},
+	}
+	sh.connInOutChan <- newconn
+
+	sh.connWaitGroup.Add(1)
+	go func(c *wsconn, accid primitive.ObjectID, deliveryChan chan<- any) {
+		sh.redisSync.Set(context.Background(), accid.Hex(), "online", 0)
+		for {
+			messageType, r, err := c.NextReader()
 			if err != nil {
 				c.Close()
 				break
 			}
 
-			switch mt {
-			case websocket.BinaryMessage:
-				msg := DeliveryMessage{
-					Alias: c.alias,
-					Body:  p,
-					Conn:  c,
-				}
-				deliveryChan <- msg
-
-			case websocket.TextMessage:
-				msg := string(p)
-				opcodes := strings.Split(msg, ";")
-				for _, opcode := range opcodes {
-					if strings.HasPrefix(opcode, "ps:") {
-						sh.redisSync.HSet(context.Background(), ConnStateCacheKey, alias.Hex(), opcode[3:]).Result()
-					} else if strings.HasPrefix(opcode, "cmd:") {
-						cmd := opcode[4:]
-						msg := DeliveryMessage{
-							Alias:   c.alias,
-							Command: cmd,
-							Conn:    c,
-						}
-						deliveryChan <- msg
-					}
-				}
+			if messageType == websocket.CloseMessage {
+				sh.callReceiver(c.sender, CloseMessage, r)
+				break
+			}
 
+			if messageType == websocket.TextMessage {
+				// 유저가 직접 보낸 메시지
+				sh.callReceiver(c.sender, TextMessage, r)
+			} else if messageType == websocket.BinaryMessage {
+				sh.callReceiver(c.sender, BinaryMessage, r)
 			}
 		}
+		sh.redisSync.Del(context.Background(), accid.Hex())
+		sh.connWaitGroup.Done()
 
-		sh.redisSync.HDel(context.Background(), ConnStateCacheKey, c.alias.Hex()).Result()
-
-		sh.Lock()
-		delete(sh.conns, c.alias)
-		delete(sh.aliases, accid)
-		sh.Unlock()
-
-		var funcs []func()
-		c.lock.Lock()
-		for _, f := range c.onClose {
-			funcs = append(funcs, f)
-		}
-		c.onClose = nil
-		c.lock.Unlock()
-
-		for _, f := range funcs {
-			f()
-		}
+		c.Conn = nil
+		sh.connInOutChan <- c
 	}(newconn, accid, sh.deliveryChan)
 }
 
@@ -551,17 +506,14 @@ func (sh *subhandler) upgrade_nosession(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	alias := accid
+	var alias string
 	if v := r.Header.Get("AS-X-ALIAS"); len(v) > 0 {
-		alias = common.ParseObjectID(v)
+		alias = v
+	} else {
+		alias = accid.Hex()
 	}
 
-	initState := r.Header.Get("As-X-Tavern-InitialState")
-	if len(initState) == 0 {
-		initState = "online"
-	}
-
-	upgrade_core(sh, conn, initState, accid, alias)
+	upgrade_core(sh, conn, accid, alias)
 }
 
 func (sh *subhandler) upgrade(w http.ResponseWriter, r *http.Request) {
@@ -597,24 +549,12 @@ func (sh *subhandler) upgrade(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	alias := accid
+	var alias string
 	if v := r.Header.Get("AS-X-ALIAS"); len(v) > 0 {
-		alias = common.ParseObjectID(v)
+		alias = v
+	} else {
+		alias = accid.Hex()
 	}
 
-	initState := r.Header.Get("As-X-Tavern-InitialState")
-	if len(initState) == 0 {
-		initState = "online"
-	}
-
-	upgrade_core(sh, conn, initState, accid, alias)
-}
-
-func (sh *subhandler) makeRichConn(alias primitive.ObjectID, conn *websocket.Conn) *Richconn {
-	rc := Richconn{
-		Conn:    conn,
-		alias:   alias,
-		onClose: make(map[string]func()),
-	}
-	return &rc
+	upgrade_core(sh, conn, accid, alias)
 }