ikr!? I did! BUt then i remembered him being a psycho path and that he just is fucked up and un guilty of what ever he does to him. Sure he doesn't want to loose him and he may think Bum is the only one that cares for him. But then you have to remember if Bum did get out its because of Sangwoo's ignorance and he could potentially go to jail for tons of crimes. then he would be fucked. So in a way was it because he generally was scared of loosing him, or was it because he didn't want to get caught. Remember he see's Bum like his mother. He's so fucked up, which makes me feel sympathy for him knowing how broken he is and that's what makes it disturbing. The hope and the crushing reality.
I totally agree with you, also if bum and sangwoo really did get into a relationship of some sort. Then I don't think that sangwoo would change his behaviour, and he would probably even kill bum if he ran away.
Did anyone else see sangwoo trembling in the end of chapter 23, it was like he was generally scared of losing bum. The thing is he turned more scary when he was panicking (⊙…⊙ )