https://blog.faceutil.com/2017/03/26/msx-cf%ec%b9%b4%eb%93%9c-%ec%9d%b8%ed%84%b0%ed%8e%98%ec%9d%b4%ec%8a%a4-%ed%8c%8c%ed%8b%b0%ec%85%98-%ec%84%a4%ec%a0%95-ideatime-%d1%86/