https://blog.gongquiz.com/2021/04/07/%ed%96%a5%eb%b6%95%ec%96%b4%eb%82%9a%ec%8b%9c-%ec%b4%9d%ec%a0%95%eb%a6%ac-%eb%90%9c%eb%96%a1%eb%b0%a5-vs-%eb%ac%bd%ec%9d%80%eb%96%a1%eb%b0%a5-%ed%96%a5%eb%b6%95%ec%96%b4%ec%9d%98-%ec%84%a0/