I agreed, and I also think he kills women because they remind him of something about his mother he never liked, we see sangwoo didn’t like his mother that much, he really loved his father, and his mother probably killed the father and it look like he did it, it could be that all women remind of the wicked mother he had but he keeps Bum around because that’s another of the his mother he liked, like the caring part. Psychologically, every human has multiple sides to them, and that’s why we are not the same around people, even the ones we know or they feel like they know us.
I want Bum to die
Well Sangwoo deserves to die so it's no tragic if he dies.
Everytime I think I understand what Sangwoo wants, then I'm confused again. Like, what is it about his father that Sangwoo is afraid of happening to him? What did his mother say to him and scarred him so badly? Him not being loved? Dying alone? And if either of this are the case, why did he start killing women?
P.S. I really don't want Sangwoo or Bum to die! They're such great characters.