I agree It is very frustrating, but at the same time it's really hard to hate. Because of the family abuse he basically views himself as total crap and lacks self-worth. I haven't read the novel but I like how in the webtoon, the interactions like trying to achieve something at his own expense (body), petting his rich friend who acts like a baby, trying to use his body just to get connections, let the guy grope him just to let her in the team. Hell, in the beginning just sacrificing himself and kept telling them about the trap. It just saddens me to see this and then have other characters calling him selfish.

I finished the entire novel (read it btw!), and i am also annoyed by how self-sacrificial jaechan is! He’s still a pretty strong character, but this aspect of him pisses me off sometimes lol