Responses
Actually, his behavior made sense ..in a sense (xD). He's behaving erratically because it is the the after effect of how his father and mother treated him. It's a cross between not wanting to be his dad and actually repeating the cycle because that's how he was raised x2 (I'm sure the dad wasn't dropping bodies around there). He probably offered sex to be assure Bum that he "loves" him and when Bum rejected him, it felt like he was leaving him or not loving him anymore.
So in my point of view the update didn't take long at all, but could we just talk about this chapter for a sec? So chapter 86 and chapter 160 was like tf? for me, also the flashback wasn't as confusing as it seems at the beginning because, obviously, that's his mother that's being all cray cray. Also, the moment where sangwoo was trying to act all nice and shit was weirding me out because I thought he was going to kill Yoonbum for trying to kill himself (I know that doesn't make sense). Anyways, but then there was like a super awkward vibe going through -in my opinion- and then he was like "Wanna do it?" wtf? Who say's that after someone tried to kill themselves lol? But then he got all crazy when Bum didn't want to *do it*, like bro, chill the fuck out! And then there's this sick conflict with sangwoo being like his father, so yeah, that was weird af too. But I'm still super hiped for the next chapter to come out (≧∀≦)