I only just now realized that Bum is wearing the clothes of Sangwoos mother
http://www.mangago.zone/read-manga/killing_stalking/mf/c021/27/
Holy shit...
>o<
We can all agree that Sangwoo is psychologically damaged.
But consider the following.
Sangwoo telling Bum about his parents, taking him were his parents took him, and giving Bum the opportunity of murder as a present (or her body for sex as a present) can actually be seen not only as symptoms but as self reflection. Sangwoo is like a blinded and deeply psychologically damaged monster reflecting on itself.
There is nothing else he can do than damage others and enjoying it in his perverse mind - but I think he is now realizing himself to some degree, because of the encounter with another person (because he usually would just get rid of them).
Every extreme emotion towards Bum could be seen as a reaction to his self-reflection. Especially anger and frustration.
And another interesting thing is how extreme he reacts to blood. And his halluzination (the man on the road - his father?)
He is just an interesting case on a psychological level. Because Sangwoos brain basically works entirely different than it should.
I'm not saying that Bum can "cure" him. At some point, even self-reflection fails. I don't think anything could cure Sangwoos psychological damage. And at this point, not even Bum would be able to handle this trauma.
Ps. In psychological studies it's sometimes said that children (unconsciously!) see their parents relationship as a goal for their own future relationship.
By this point it just makes no sense. Kang Jinha only has to explain to Siwon what is going on. There is absolutely no reason not to. This is just a lazy plot device to lengthen the plot.
While I too think it's a plot device to lengthen out the story
I think the only plausible reason Jinha isn't telling Siwon is that
>tells Siwon
>Siwon understands and stays away from baddie
>baddie boy is like damn you know now, now I can't have my fun
>baddie does crazy rich guy bad stuff and possibly hurts Siwon (which we know Jinha wants to avoid at all costs)
Maybe he's overprotective to that extent, that he doesn't even want to tell Siwon bad things. Like a parent refusing to tell their kid about the harsh reality of the world.
Yours is plausible as well.