He been involved in delinquent activity and gang related stuff he had frineds in gangs and they were fighting with rival gang and one those people he fought came back for revenge and hit him in back his head that's how he got amnesia, also that gang guy is the one who pushed juyeon to get revenge on jiwook, and I believe the big guy who raped jiwook is related to that gang guy, I think he his younger brother or something, and juyeon been financially helping that gang guy so he would help him get revenge on jiwook, he also the one who taught juyeon how to fight, juyeon was really small tamed kid he was chasing after jiwook for five years to get his revenge on him, even went to same college as jiwook just for that.
And when juyeon first learned of jiwook having amenisa he went to visit him in hospital and even thought of starting new with this jiwook who doesn't remember anything of their past but jiwook literally said he must be after man embracing him and even threaten juyeon with rape in the hospital thatewhen juyeon decided that if he wanted to have jiwook he had to break him, he planned in throwing jiwook after breaking him but in end he will keep him cuz jiwook would cry and tell him not to abandon him

I saw memes abt this on tt and I came back and its still absolute bs (in a good way) like im crying at how Jiwook had to ride his way out of solitary confinement. I know his room was musty af can someone spoil and tell me what he actually did?? Id read the novel but I have exams