diff --git a/draw.py b/draw.py
index cabd0b4..589e8cf 100644
--- a/draw.py
+++ b/draw.py
@@ -1,7 +1,28 @@
 import pygame, sys,threading
 import json
 
-def sendDraw(sock):
+def drawUserList(nowUserList,screen):
+    listSTR = nowUserList[7:]
+            
+    listJSON = json.loads(listSTR)
+    #[['127.0.0.1', 52362], ['127.0.0.1', 52370]]
+    y = 100
+    cross = 20
+    pygame.draw.rect(screen,(255,255,255),[900,100,200,380])
+    for sockName in listJSON:
+        pygame.draw.rect(screen,(171, 254, 250),[900,y,200,30],0)    # 輸入匡的矩形
+        pgStringVar = pygame.font.Font(None,25).render(str(sockName),False,(0,0,0))# 文字物件
+        screen.blit(pgStringVar,(910,y+10))# draw font
+        pygame.display.update()
+        y = y+30+cross
+
+def drawerReceive(sock,screen):
+    while True:
+        data = sock.recv(1024).decode('utf-8')
+        if data[0:6] == "[list]":
+            drawUserList(data,screen)
+
+def sendDraw(sock,nowUserList):
     white= (255, 255, 255)
     black= (0, 0, 0)
 
@@ -10,14 +31,21 @@ def sendDraw(sock):
     size= [1080, 480]
     screen= pygame.display.set_mode(size)
     clock= pygame.time.Clock()
+    screen.fill((255, 255, 255))
 
+
+
+    # 開始話user list
+    drawUserList(nowUserList,screen)
+    drawerRecvThreading = threading.Thread(target=drawerReceive,args=(sock,screen))
+    drawerRecvThreading.start()
     # 使系統滑鼠圖標不可見
     #pygame.mouse.set_visible(False)
     
     dotPos = []
 
     mouseFlag = False
-    screen.fill((255, 255, 255))
+
     pygame.display.update()
     tempPos = ()
     while True:
@@ -112,18 +140,8 @@ def receiveDraw(sock):
             pygame.quit()
             sys.exit()
         elif data[0:6] == "[list]":
-            listSTR = data[7:]
-            
-            listJSON = json.loads(listSTR)
-            #[['127.0.0.1', 52362], ['127.0.0.1', 52370]]
-            y = 100
-            cross = 20
-            for sockName in listJSON:
-                pygame.draw.rect(screen,(171, 254, 250),[900,y,200,30],0)    # 輸入匡的矩形
-                pgStringVar = pygame.font.Font(None,25).render(str(sockName),False,(0,0,0))# 文字物件
-                screen.blit(pgStringVar,(910,y+10))# draw font
-                pygame.display.update()
-                y = y+30+cross
+            drawUserList(data,screen)
+
 
             continue
         #print(data)
diff --git a/main.py b/main.py
index fc586ed..ab07059 100644
--- a/main.py
+++ b/main.py
@@ -99,12 +99,15 @@ class Room:
         listensock.bind((self.ip,self.portNum))
         print("\t{}:{}".format(self.ip,self.portNum))
         listensock.listen(5)
+        emptyFlag = True
         while True:
             sock,sockname = listensock.accept()
             print("[ {} ]{} has connected.".format(self.portNum,sockname))
 
-            self.sockList.append(sock)      # 把sock放入list
             allPeerName = []
+            self.sockList.append(sock)      # 把sock放入list
+
+            # Send socket list to client to build a user list and put it beside picture.
             for i in self.sockList:
                 allPeerName.append(i.getpeername())
             for sock in self.sockList:
@@ -112,7 +115,18 @@ class Room:
             receiveDataThread = threading.Thread(target=self.receiveData,args=(sock,))
             # 負責與client通信，傳輸遊戲所必須的指令
             receiveDataThread.start()
-            
+
+            if emptyFlag:
+                self.game()
+                emptyFlag = False
+
+    def game(self):
+        mainSocket = random.choice(self.sockList)
+        for sock in self.sockList:
+            if sock == mainSocket:
+                sock.send('[prob] {}'.format(self.problem).encode('utf-8'))
+            else:
+                sock.send('[gues]'.encode('utf-8'))
     def connect(self):
         time.sleep(0.5)
         sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
@@ -143,6 +157,13 @@ class Room:
                     elif data == 'exit':
                         sock.send('exitok'.encode('utf-8'))
                         self.sockList.remove(sock)
+                        allPeerName = []
+                        # Send socket list to client to build a user list and put it beside picture.
+                        for i in self.sockList:
+                            allPeerName.append(i.getpeername())
+                        for sock in self.sockList:
+                            sock.send("[list] {}".format(json.dumps(allPeerName)).encode('utf-8'))
+
                     else:
                         sock.send('n'.encode('utf-8'))
 
@@ -174,7 +195,6 @@ class Client:
             # receiveDataThread.start()
             # sendDataThread = threading.Thread(target=self.sendData,args=(sock,))
             # sendDataThread.start()
-            draw.sendDraw(sock)    # 開始繪圖
 
         elif receiveMsg=="OK.CLIENT":
             roomNum = input("Room Number> ")
@@ -188,19 +208,39 @@ class Client:
             # receiveDataThread.start()
             # sendDataThread = threading.Thread(target=self.sendData,args=(sock,))
             # sendDataThread.start()
-            draw.receiveDraw(sock) # Start to receive mouse position to draw picture what MAIN client draw. 
+        
         else:
             print("ERROR TYPE")
+            exit
 
-    def receiveData(self,sock):
-        while True:
-            data = sock.recv(MAX).decode('utf-8')
-            if data:
-                print(data)
-    def sendData(self,sock):
-        while True:
-            data = input("> ")
-            sock.send(data.encode('utf-8'))
+        userList = sock.recv(1024).decode('utf-8')
+        print("List: ",userList)
+        
+        continueFlag = False
+        while not continueFlag:
+            data = sock.recv(1024).decode('utf-8')
+            role = data[1:5]
+            #print("Role: ",role)
+            if role == "prob":
+                draw.sendDraw(sock,userList)
+            elif role == "gues":
+                draw.receiveDraw(sock)
+                continueFlag = True
+            elif role == "list":
+                userList = data
+                print("List: ",userList)
+                continueFlag = False
+            else:   #useless position
+                continueFlag = False
+    # def receiveData(self,sock):
+    #     while True:
+    #         data = sock.recv(MAX).decode('utf-8')
+    #         if data:
+    #             print(data)
+    # def sendData(self,sock):
+    #     while True:
+    #         data = input("> ")
+    #         sock.send(data.encode('utf-8'))
 def main():
     ip = sys.argv[2]
     port = sys.argv[3]