I feel this way, too. They are all victims, and they are all perpetrators of something wrong. They are kids, and sometimes, we forget that and judge them like adults. What Jaeha did he did as a VERY small kid and it was purely an emotional response to bullying/isolation. What Yoseob did he did out of wounding from abuse. Taeoh was a kid, too. Yura, too. And they all have suffered for what they did. The parents, too, didn't get Yoseob the therapy any normal, sane, not idiotic person would realize was necessary. I mean, the kid was raised in a hellhole and shows up with fractures and bruises and lacerations. Who would think the kid DOESN'T need comprehensive mental health assessment and treatment????
This shows how human and flawed and needy and afraid and damaged people can be, and I really feel sorry for all of them. Except the parents. Yoseob's parents needed to be buried alive. Jaeha's needed a clue, cause, "What the fuck were you thinking, you two, not getting that child help???"

I don't hate anyone in this manga, everyone is at fault, they all are going through a lot , Yoseb, Yura, the brother, that guy with the scar, they are admitting their mistakes and that takes a lot of courage, everyone, EVERYONE is a vitcm too, it doesn't matter how big or small the problem is it still hurts, i hope Yoseb gets treatment if the bro didn't stop him he would be better by now, i hope Yura learn from everything and become a better person so she can make real friends, i think the scar guy telling her everything even if ir hurted her was necessary so she can change , i hope the bro overcome his fears and the guy with the scar apologise and become friends with the bro again