
So ... He likes Kihyun and slept with his girlfriend? I really do not like plot like that, but I looked at the raws and it looks interesting... I find it so cruel to Kihyun, he seemed to be really in love with her... I do not know if I could forgive something like that but this is my opinion, any plot that has cheating already makes me nervous ╥﹏╥

So..... He can not love any woman and cheat them because his friend rejected him???? (〜 ̄△ ̄)〜
And I hate this talk of not being able to stay with the person you love because you want him to have a normal family... This is so depressing, especially when the person likes you too...

No. The guy is not the one cheating. Meaning that he is not commiting adultery. He sees a woman who already has someone elde. "Laying your hands on another's will make no one happy" The "someone's" is the short form of "someone elses", wich means "someone who already belongs to someone else".
Hope it is clear now. The dude isn't cheating.
Another plot based on rape and abusive relationship... No, thanks