Minsu, or XiKang is pairing name for Choikang Changmin and Xiah Junsu from korean pop group DongBangShinKi made by their fans.
They are totally opossite from each other. One is pure, innocent and relly childish. The other is very smart, blunt, tidy and really evil. 
The Angel and The Evil. That's what MinSu is. 
And their brotherly friendship? I'll make sure you'll feel it.