https://blog.faceutil.com/2020/07/15/%eb%a7%88%ec%9a%b0%ec%8a%a4-%ec%98%a4%eb%a5%b8%ec%aa%bd-%ed%95%b4%ec%a0%9c-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-spell-%e3%8f%83/