speculation! but i think it’s bc mc is the first person to “reject” her and that’s why she’s hell bent on getting him
when she fails to do so she feels wronged by it in a way? because why wouldn’t people like her, she’s rich, pretty, well mannered etc. she thinks she’s a catch for our poor mc and she’s right but mcs goals are different and i think he feels like the girl could do better than himself who can’t offer money (he’s poor), time (he has to stay on top of his classes bc he’s on scholarship), or even a family name (he’s a orphan)
like what the black haired man is saying, she seems like what a typical rich person might be like: self centered and they get what they want, if they don’t they’ll either break it so no one can have it or break it and take it with them

They're so gay for each other
Also why is hyejin(pink haired girl) so mean?