So… what does he see in her again?
Because underneath all the attitude and perceived haughtiness is a sincere young woman who gives it her all in everything she does. Even when it's difficult, even when it's painful, even when she's completely out of her depth; she's always trying her best. Even with all of her talent and natural ability, not to mention her family standing and popularity, she doesn't coast by on her talent or look down on and/or demean others as "beneath" her.
Add on the fact that she's an objectively beautiful young woman who has no few cute moments in his presence, and you've just about got what a lot of people would consider the complete package: attractive, sincere, hard-working, kind, and very capable. It's the reason she's so popular at the school. Then on top of that you have to keep in mind: she's only confrontational with and giving grief to Kuze. To everyone else she's polite and ladylike. And- correct me if I'm wrong- he doesn't hold it against her because he
knows why she's so hard on him, namely that him doing the perceived bare minimum to get by runs antithetical to her own beliefs of giving it her all. Especially when
she knows full-well that Kuze is much more capable than he appears yet continues to slack off.