I think jiwook doesn't have family, he basically grow up around gangs he delinquent, older gangs were hitting on him when he as kid that's how his homophobia got developed and he projected it on young juyeon, and juyeon didn't even want revenge at start when he visited jiwook in hospital after he had his head injury he wanted to start over but jiwook basically threatened him with rape again saying something like juyeon looked like he desire to be held by man or that he basically f@ggot, insignificant enough for jiwook not to remember him after he got amnesia that's how juyeon got so pissed of and start planning his revenge on jiwook, so from very beginning juyeon obsession over jiwook was not out hatred I believe he liked him but I don't believe it's still love he feeling toward jiwook more like desire to destroy everything jiwook have so he have no one else but to cling to juyeon and that's why he did to him when he deleted all his contacts and even try to get sukhyuk
I mean if you wanna get revenge, like he did to you in past make a gangrape video of him and send it to his mother as he did. Why make him go this hell. Id prefer that than this. This is definitely a obsessed motherfucker behavior and some shi.