She doesn't answer a lot of questions :'> But I think Sangwoo doesn't like seeing someone's being bullied. Yes I know he's a psychopath and he himself did a lot of worse things, but remember how Sangwoo would always get upset when Bum mentioned he was raped by his uncle? That makes me think that Sangwoo doesn't like seeing people got bullied, raped or anything that has the same nature.
I do remember Sangwoo protecting Yoon Bum from that childhood classmate and even from Jieun but that was after getting to know Yoon Bum.
But uugh I just really need a flashback chapter in Sangwoo's POV during the military training!!
Like did he help Yoon Bum because Sangwoo can't stand bullying/hurting/r*ping or did he feel compelled to help because Yoon Bum resembles his mother??
Has Koogi ever answered any questions about how/why Sangwoo helped Yoon Bum backed then?
I read her past Q&As and she only answered the question with "it's a spoiler, keep reading".
Now that the series ended there still wasn't a flash-back to the military training incident or any answers to whether Sangwoo even remembered Yoon Bum (unless I missed a chapter).