Mystery yet to be solved look in further
Sangwoo does not like Bum. He is a
narcissistic psychopath. And I'm not saying it as an insult. He is literally a psychopath, meaning he lacks the ability to feel certain emotions like empathy, love, and (insert all other positive emotions). This is a psychological horror story; so whatever happened in the past with Sangwoo's mom and dad royally effed him up. I think he has an attachment towards Bum because he reminds him of his mother, but if push comes to shove Sangwoo would kill bum in a second and probably not feel much about it. You should look up some documentaries, journals, and articles about psychopaths its a really interesting disorder. The writer of this comic has brillantly portrayed it with the character of Sangwoo. I would love to go into more detail about it and tell you my thoughts but ain't nobody got time for that lol!
Yep, plus he's seemingly pretty well established in society. Has friends and such. And he's also a charming but manipulating person.
I wonder if sangwoo likes bum, or if bums just a replacement for his mother