https://blog.faceutil.com/2020/07/17/spell-v2-4-%ec%9d%b8%ed%84%b0%eb%84%b7-%ed%8e%8c-%eb%b0%a9%ec%a7%80-%ed%95%b4%ec%a0%9c-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-%ec%b5%9c%ec%8b%a0%eb%b2%84%ec%a0%84-2009%eb%85%84-11%ec%9b%94-30/