diff --git a/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java b/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java
index ea63b32..542c07d 100644
--- a/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java
+++ b/src/main/java/org/ntlab/tampoposerver/models/ChatRooms.java
@@ -13,9 +13,21 @@
     private String newContent;
     private String chatRoomNumber;
     private List<Message> messages = new ArrayList<>();
+    private List<String> users = new ArrayList<>();
 
-    public ChatRooms(Integer chatRoomId) {
+    public ChatRooms(Integer chatRoomId, String user0Id, String user1Id) {
+
         this.chatRoomId = chatRoomId;
+        this.user0Id = user0Id;
+        this.user1Id = user1Id;
+    }
+
+    public String getUser0Id(){
+        return user0Id;
+    }
+
+    public String getUser1Id(){
+        return user1Id;
     }
 
     public Integer getChatRoomId() {
@@ -27,6 +39,13 @@
     }
 
     public void addUser(String userId) {
+        if (!users.contains(userId)) {
+            users.add(userId);
+        }
+    }
+
+    public List<String> getUsers() {
+        return new ArrayList<>(users);
     }
 
     public void put(Integer chatRoomId, String chatRoomNumber) {