private void Initialize()
{
CameraManager.Initialization();
SceneManager.LoadSceneAsync(sceneBuildIndex: 1, LoadSceneMode.Single);
// load progress 0
PageManager.Initialization();
PopupManager.Initialization();
MessageBoxManager.Initialization();
// load progress 1
SceneManager.UnloadSceneAsync(0);
PageManager.Open(PageId.Main);
}