diff --git a/src/server.py b/src/server.py
new file mode 100644
index 0000000..7d2597a
--- /dev/null
+++ b/src/server.py
@@ -0,0 +1,83 @@
+import pickle
+import socket
+import threading
+from pyngrok import ngrok
+
+
+class Server:
+    LISTEN_QUEUE = 10
+    RECV_BUFFER = 11264
+    PORT = 50000
+
+    def __init__(self, auth_token):
+        self.socket = socket.socket()
+        self.socket.bind(("127.0.0.1", self.PORT))
+
+        ngrok.set_auth_token(auth_token)
+        self.tunnel = ngrok.connect(self.PORT, "tcp")
+        print("JOIN CODE: ", self.tunnel.public_url.replace("tcp://", ""))
+
+        self.clients = []
+        self.chat_log = []
+
+        self.start()
+
+    def start(self):
+        print(f">>> STARTING SERVER@{self.PORT}")
+        client_accept_loop = threading.Thread(target=self.client_accept_loop)
+        client_accept_loop.start()
+
+    def client_accept_loop(self):
+        print(">>> CLIENT ACCEPT LOOP STARTED")
+        self.socket.listen(self.LISTEN_QUEUE)
+        while True:
+            client = ClientSocket(self, *self.socket.accept())
+            self.on_new_client(client)  # EVENT CALLBACK
+
+    ######################################################################################
+    # EVENTS #############################################################################
+    def on_new_client(self, client):
+        print(f"\n>>> NEW CLIENT -> {client.display_name}@{client.ip}:{client.port}")
+        self.clients.append(client)
+        receive_loop = threading.Thread(target=client.receive_loop)
+        receive_loop.start()
+        print(">>> STARTED NEW CLIENT'S RECEIVE LOOP")
+
+    def on_new_msg(self, msg_data):
+        print("\n>>> NEW MESSAGE -> [{}] {}: {}".format(*msg_data))
+        self.chat_log.append(msg_data)
+        for client in self.clients:  # RELAY CHAT TO ALL CLIENT(s)
+            client.pickle_and_send(msg_data)
+
+    def on_client_disconnect(self, client):
+        print(f">>> CLIENT DISCONNECTED -> {client.display_name}@{client.ip}:{client.port}")
+        self.clients.remove(client)
+        del client
+
+
+class ClientSocket:
+    def __init__(self, server: Server, connection, address):
+        self.server = server
+        self.connection = connection
+        self.ip, self.port = address
+
+        self.display_name = self.connection.recv(self.server.RECV_BUFFER).decode()
+
+    def pickle_and_send(self, data):
+        serialized_data = pickle.dumps(data)
+        self.connection.sendall(serialized_data)
+
+    def receive_loop(self):
+        while True:
+            msg_data = self.connection.recv(self.server.RECV_BUFFER)
+            if msg_data:
+                msg_data = pickle.loads(msg_data)
+                self.server.on_new_msg(msg_data)  # EVENT CALLBACK
+            else:
+                self.connection.close()
+                self.server.on_client_disconnect(self)
+                break
+
+
+if __name__ == '__main__':
+    Server()