
Hm. Despite the fact that Yoseob was raised in a bad way, that doesn't excuse the fact that he committed a crime. We shouldn't be giving him pity.
All in all, I think everything would've been fine if they just killed him. You can't control and change a monster which you created, in the end, you created that psychopathic monster and the only way to end it permanently is to kill him.
It would count as self defense since he was the first who harmed the other.

"psychopath" "monster"? Erm, he was a child who came from an abusive home, and this resulted in him having a range of mental health problems which went unnoticed and untreated. His brothers death was accidental, and his knife murders a tragedy. Yoseob never understood love, he was never shown this as a young child so developed attachment issues to his cousin, he's now in hospital, not sure why you want him to be murdered too, what would that achieve ?
I kinda wish he was a bit more affectionate
I wish he was WAY more affectionate >:(