This black guy is also chairman's son but as he is weak she is out of the inheritance and in the line are his sister her elder sister died with hands of 2nd older sister now she is and jaehyun left as jaehyun is out of inheritance and older sister is pretty greedy also she is in drug abuse clearly chairman lee had a secret child it's blondie and jaehyun knows it and clearly didn't told mc because it's a two birds in one stone 1st he gets mc and also the position of chairman as there are no heir .. he is clearly shady from first and i don't know what is  female lead 's fault i mean she should not have involved him but he is clearly invoved way before in this journey of revenge.. she is strict on her revenge to kill and defeat chairman lee i don't think it's female leads fault