@Leonhart93
I'm not sure about Jisoo totally not at fault. I mean, look at her situation. If you're suddenly confronted like that, in the class and everyone looking at you like that, it's really hard to say anything. It just so sudden. It's admirable she didn't run away crying at that time. When it happen so suddenly, your mind just doesn't work properly and try to make sense what happen.
So it's not her fault she doesn't said anything. And the classmates also push and push like that, you're not given time to even think. When she tried to explain after she have a minute to really think about it, Jisoo doesn't even want to listen and already think she's wrong, in some way.
It'll be a moment when you sometimes think back about what you could've should've said. Also, Jisoo could ask her in private or maybe after the mishaps in the class, ask her again. She said they were friends. But she easily trust others rather than hearing her friend side of the story.
It is also a past she rather forget and leave it be and it's not wrong because it traumatized her. The ML should've considered about her feelings and if he still wants to pursue her, try different methos and not be so aggressive.