I haven’t read this in awhile, why is he being raped………?

Basically Yujin fled the country (he got a forged passport with a new identity and everything) because he’s terrified of his father and was scared he’d try to kill Aaron again. Obviously he did so without Aaron’s knowledge and Aaron couldn’t find him for months which pissed him off and made him go insane pretty much. He finally tracked Yujin down and decided to show his true nature as the absolute piece of shit he is.