Can just someone explain everything to me? So messed up

i think the last chapter does a good job at talking about the characters and symbols, so you should look at that, but here's the rundown
yoseob, a kid abused by his parents, gets adopted by his uncle (i think) who has a son, jaeha, who's being outcasted by taeoh.
yoseob becomes obsessed with jaeha to the point where he is a danger to others, but jaeha hides this fact because he believes yoseob is his safe place.
taeoh and yura, previously assaulted by yoseob, come together with jaeha to try and hospitalize yoseob.
the police officer in the last few chapters has an uncanny resemblance to jaeha, which is why yoseob sees jaeha in him. and obviously, jaeha dies.