Are you blind or something? It's in the damn chapter, you moron.
Well, if reading comprehension is hard for you , I'll show you the "proof". While they were physically beating on him, Minwoo said to stop because his mother and Skylar's mother are friends and if they find out about what they are doing, it'll cause problems and it'll be annoying. Unless you do it in a way it wouldn't show. Then they took Skylar's clothes off to physically abuse his body instead of his face and to humiliate him. Did you see all the bruises on his stomach?
What they did wasn't "rape", it was sexual assault, physical assault and slander.
that old best friendo is a PSYCHO. i know we should leave him in the past cuz if thats wut skylar wants then okay, but—-okay even if u felt like your “friendship and brotherhood” was betrayed by him giving you one nonconsensual peck on the lips while he was drunk, WHO in their GADAMN RIGHT MIND would respond by leading a group of guys to beat him up and g*ngr*pe him while u fuckin watch?!? like, 0 to a FUCKIN HUNDRED much?!?! not to even mention destroying his whole social life with the rumors… im actually still shocked like he is actually a good fckin actor to be hiding those PSYCHOPATHIC TENDENCIES during their almost TEN YEAR relationship. you EVIL MOTHERFUCKER i hope you end up jobless, no highschool diploma, friendless, bald, and live a THOUSAND TIMES more lonely and miserable than u made Skylar for the REST OF YOUR LIFE until you die alone in an alley with no one to even see or care for your body before the rats and vultures come to eat away at the remains. And i hope in your last moments, you remember the friend that would’ve cared had you not thrown him away and stepped all over him like you did. I hope the regret eats away at you more than the rot does.