From my understanding in the start it was yuwon, then once dohun joined the picture he started to get builled with yuwon. Yuwon was in a delusional state thinking it was only dohun, but in reality yuwon was always picked on
That is the twist, Yu-won is an unreliable narrator...because at one point Yu-won started believing that Dohun is the one who is getting bullied and he got dragged into this but in reality he was the one who got bullied.
It is steamed from how he always blamed others for his misery, specially Dohun. It is some kind of protecting mechanism for him.
Why do the two character backstories have different perspectives and happenings? Idk which one was the ACTUAL happening.. was dohun actually the one being bullied or yuwon? This is such an amazing story that even a smart b like me got thinking dumb