you had been attracted to heeseung back then. You are in the same class as him. he's truly attractive, and that's what makes all the girls go crazy over him. but your feelings changed when you got to know him. it's because he's the type of person who is arrogant and tends to make fun of other people without reason. and he's enjoying the attention that he's getting from all the girls. You felt annoyed by his actions. And since you're in the same class as him, you always see him and you're trying ur best to avoid him, to the point that whenever your eyes meet you are the first to look away.

on the other hand, he was surprised by your behavior. normally, he would always be the one who looked away whenever he made eye contact with a girl. that's because they're crazy for him. and it makes him think that ur different because u're not acting like all the girls around him.

one time, after class, u were packing all ur things to get home. u thought u were the only one in the room when Heeseung grabbed your hand and asked you to be his fake gf, he wanted to get all the girl's attention as in everyone including you.