public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();

        GUILayout.Space(10);
        GUILayout.Label("Level");
        serializedObject.Update();
        selcet.level = (Level)EditorGUILayout.ObjectField(selcet.level, typeof(Level), false);
        if (GUILayout.Button("Clear"))
        {
            selcet.Clear();
        }
        if (!selcet.level)
        {
            return;
        }

        if (GUILayout.Button("Save"))
        {
            selcet.Save();
        }
        if (GUILayout.Button("Load"))
        {
            selcet.Load();
        }
    }