First things first

me too i notice this but i was so afraid to tell this is make me dizzy to see it

he thick tho
sangwoo's big yaoi hands creep me out tbh, lookin like they're about to accidentally choke someone to death

I think is due to his childhood. Like, when he lived with his uncle he did not eat well so now his complexion is like that ( his body structure). Also, it might be different now but when he was in Sangwoo's basement and everything he did not eat well at all too.

Or you know, not accidentally haha

wow lmao(⌒▽⌒)

he is malnournished because of years of abuse, his uncle sometimes forbade him to eat in order to punish him, check chapter 25/26.