diff --git a/Client/src/asteroid/main.cpp b/Client/src/asteroid/main.cpp
index 1a616c8..46a6dd4 100644
--- a/Client/src/asteroid/main.cpp
+++ b/Client/src/asteroid/main.cpp
@@ -71,7 +71,7 @@ std::int32_t main(std::int32_t argc, gsl::zstring* argv) {
   window.TryMoveToMonitor(0);
 
   veng::Graphics graphics(&window);
-  veng::Engine engine(&graphics, &tp);
+  veng::Engine engine(&graphics, &tp, &iocp);
 
   engine.LoadModelAsset("assets/player.fbx", "player");
   engine.LoadModelAsset("assets/player_flame.fbx", "player_flame");
diff --git a/impl/vulkan_engine/vulkan/engine.cpp b/impl/vulkan_engine/vulkan/engine.cpp
index 162757b..d017184 100644
--- a/impl/vulkan_engine/vulkan/engine.cpp
+++ b/impl/vulkan_engine/vulkan/engine.cpp
@@ -174,4 +174,12 @@ void Engine::Update() {
   }
 }
 
+void Engine::NetworkUpload() {
+  //TODO: 작성하기
+}
+
+void Engine::RefreshFromServer() {
+  // TODO: 작성하기
+}
+
 }  // namespace veng
diff --git a/include/socket/packet.h b/include/socket/packet.h
index c644f88..496a01d 100644
--- a/include/socket/packet.h
+++ b/include/socket/packet.h
@@ -4,7 +4,7 @@
 
 namespace Packet {
 
-enum class Opcode {
+enum class Opcode : std::uint16_t {
   NOP,
   SPAWNMODEL,
   DESPAWNMODEL,
diff --git a/include/vulkan_engine/vulkan/engine.h b/include/vulkan_engine/vulkan/engine.h
index ce15f29..416910f 100644
--- a/include/vulkan_engine/vulkan/engine.h
+++ b/include/vulkan_engine/vulkan/engine.h
@@ -4,14 +4,15 @@
 #include "graphics.h"
 #include "physics.h"
 #include "utils/thread_pool.h"
+#include "socket/iocp.h"
 
 namespace veng {
 
 class Engine {
  public:
   Engine(gsl::not_null<Graphics*> vulkan_graphics,
-         utils::ThreadPool* thread_pool)
-      : vulkan_graphics(vulkan_graphics), thread_pool_(thread_pool) {}
+         utils::ThreadPool* thread_pool, Network::IOCP* iocp)
+      : vulkan_graphics(vulkan_graphics), thread_pool_(thread_pool), iocp_(iocp) {}
 
   void init();
 
@@ -25,6 +26,9 @@ class Engine {
 
   void Update();
 
+  void NetworkUpload();
+  void RefreshFromServer();
+
   std::function<void(Engine&)> BeginPlay = [](Engine& engine) {};
   std::function<void(Engine&, std::float_t delta_time)> Tick =
       [](Engine& engine, std::float_t delta_time) {};
@@ -41,6 +45,7 @@ class Engine {
   Loader asset_loader_;
   Physics physics_controller_;
   utils::ThreadPool* thread_pool_;
+  Network::IOCP* iocp_;
 
   glm::ivec2 window_size_ = {0, 0};
   std::double_t last_frame_time_ = 0.0;