https://blog.faceutil.com/2020/05/28/%ec%9b%8c%ed%81%ac-%ec%9c%a0%ec%a6%88%eb%a7%b5-%eb%94%94%ed%8e%9c%ec%8a%a4-rpg-%ec%9b%94%eb%93%9c-%ed%8a%b8%eb%a6%ac-%eb%94%94%ed%8e%9c%ec%8a%a4-1-21a-%cf%87/