Responses
Maybe he connected the whole thing with his mother sexually abusing him? Maybe what Bum did reminded him of the past and that's why he threw up?
Wait when did his mum sexually abuse him???
beta
Wait! Did anybody noticed that Sangwoo was throwing up in the bathroom before he start laughing?!
Does that means he was disgusted with Bum?
I mean he already said that he thinks old men are disgusting then he told Bum that he's like an old man!