
Yes, I was afraid it was going to end that way at first. But as I read on, I realized Chiwoo never showed the slightest bit of romantic feelings for Jihyun. He was clearly terrified, and now it’s confirmed why he was so traumatized. His best friend raped him. I think the story portrayed realistic emotions and reactions for the most part. Unlike most yaoi, Chiwoo didn’t fall in love with his rapist and abuser.
And Jihyun, who’s manipulative and violent is pretty much the same way throughout the story. People with that kind of personality can’t just flip a switch and turn “good” because of “love”.

Here, you can see his pants is off in the second panel http://www.mangago.zone/read-manga/back_to_school/uu/iur_chapter-41/pg-30/

also even back then it looked like he's fixing his pants on the first panel http://www.mangago.zone/read-manga/back_to_school/uu/iur_chapter-19/pg-2/ . i guess that's the only amount of hint the author could give for a manga that supposed to be non-explicit.
But the more I think about it, the more pissed I get now that it’s been confirmed Jihyun raped him.....he really thought he could walk right back into Chiwoos life and be buddy buddy. His first words to him weren’t even an apology, like he really was a piece of shyt after committing such a heinous crime to someone he considered a friend and someone he loved. Do you know how fycked up you gotta be to rape someone while they’re bleeding nonstop from their face and glass shards in their back?!?!?! I’m sick all over again. It’s fyck Jihyun