Responses
This is all just my interpretation based on all the information we are given about him so far in the story. I could be wrong . But I feel like there must be a reason why he has svere mood swings and is the way he is. In stories, there's always a reason for why characters act the way they do, that of course isn't an excuse for awful behaviour but explains it I guess.
Spoilers
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In next chapter(12) JiWook will flinch when Seungeon will reach to put ointment on his face and Seungeon will say " that shouldn't be a reaction of someone who hit first" . And JiWook says that he(Seungeon) did something worth being hit. Than Seungeon say that his father would hit him even when he was in the right.
Than in chapter 14 when Hyungseo is telling JiWook about Seungeon he tells him that Seungeon is a punching bag of his family and that whenever something was wrong they would beat and blame only him(take it out on him). So I guess the reason why he said in cahp 11 " don't put your hands on me like that. I don't know about anything else but I can't tolerate/forgive that." was probably because he was being abused at home. Idk just my guess. Also it looks like he doesn't know how to have normal conversations and how to make friends exempl. JunYoung(silver haired dude). He acts more like his personal secretary than a friend lol. And when JiWook said (chap 6) they must be close friends he said that he knows everything about Seungeon but he wouldn't call it being close friends and well that tells me Seungeon, for some reason, is uncapable to have normal human relationships. I am hoping for some more character background and character development in the future chapters.