https://blog.faceutil.com/2020/06/12/%ec%bb%b4%ed%93%a8%ed%84%b0%eb%a1%9c-%ed%8f%ac%ec%bc%93%eb%aa%ac%ec%8a%a4%ed%84%b0-%ed%95%98%ea%b8%b0visualboy-%ed%95%9c%ea%b8%80-%ec%8b%a4%eb%b2%84-%ea%b3%a8%eb%93%9c-%ec%98%90%eb%a1%9c/