https://blog.faceutil.com/2020/07/14/%ec%9c%a0%ed%8b%b8-%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-spell-%e3%8e%96/