yessss it's all confusing tho lmfao
I don’t think he killed the blackhaired dude（ーー；）
I think blonde dude probably killed his father for abusing his mother, and i think his mother died from injuries since he said he couldn't save her even with the money he got from beating up black haired. He accepted black haired cus of his weird obsession that blonde hair knew that black haired would still accept and love him after finding out what he did so he probs didnt kill black haired.
- so the blonde kid had an abusive father who killed/abused his mother (stab scene where hes seen hiding and holding his mouth), as revenge he decides to kill his father and keeps him in the garage which is why police think he is missing and keeps his mom in the freezer (most likely bc he killed the father soon after/didnt want the police to find out about the murder so he could be the one to get revenge) im assuming he robbed the black haired kid so he could have money for the freezer (porbably collecting it from multiple students) since she died before that incident
- the black haired kid had a crush on blonde dude, was attacked by him, which lead to some weird obsession/stalking (i guess that makes sense?) now he kidnaps him and confesses
- blonde dude accepts confession (im thinking bc this person will provide him love his didnt get since his parents are dead and dad was abusive) and ends up killing blackhaired dude (this is more of an assumption since its not shown) so that BH dude cant leave him (kinda like in interview with a murder)