https://blog.gongquiz.com/2021/04/19/%ec%b9%b4%ec%b9%b4%ec%98%a4%ed%86%a1-%ea%b7%b8%eb%a3%b9%ec%b1%84%ed%8c%85kakaotalk-%ec%82%ac%ec%9a%a9%ec%84%a4%eb%aa%85%ec%84%9c-3-%e3%83%a8/