https://blog.gongquiz.com/2021/11/07/%ed%99%a9%ec%a0%95%ec%9d%8c-vs-%ec%9c%a4%ec%8b%9c%ec%9c%a4%ec%9d%98-%eb%88%84%eb%82%98-%ec%84%a0%ec%96%b8-%eb%8c%80%ec%a0%84-have-a-war-with-each-other-%e3%89%ac/