https://blog.gongquiz.com/2021/01/11/history-%eb%aa%85%eb%a0%b9%ec%96%b4%eb%a5%bc-%ec%9d%b4%ec%9a%a9%ed%95%b4-%ec%82%ac%ec%9a%a9%ec%9e%90%ea%b0%80-%ec%9e%85%eb%a0%a5%ed%95%9c-%eb%aa%85%eb%a0%b9%ec%96%b4%eb%a5%bc-%ed%99%95%ec%9d%b8/