https://blog.gongquiz.com/2021/07/21/190824-history3-trapped-in-korea-%ec%98%a4%ec%8a%b9%ec%96%91%ec%84%9c%ea%b7%a0%ed%98%b8-%ec%82%ac%ec%a7%84-%eb%aa%a8%ec%9d%8c-%ec%98%81%ec%83%81-%e2%85%a4/