https://blog.faceutil.com/2017/05/11/ps2-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c-%ec%97%90%eb%ae%ac-2%ec%b0%a8-%ec%8a%88%ed%8d%bc%eb%a1%9c%eb%b4%87%eb%8c%80%ec%a0%84-%ec%95%8c%ed%8c%8c-%ec%a0%a0%ea%b0%80-%ec%a0%84%ed%88%ac/