Your boyfriend Jisung had gotten braces, and he was embarrassed to tell you, since you've always had perfect teeth ever since you were a child.

He was trying to avoid you the whole time at school. He kinda felt bad for doing it, but he still didn't want to embarrass himself in front of you. Then, you started to wonder why he was avoiding you. You started to be concerned and decided to confront him about it.

He was trying to get to his class while avoiding you, until you got in front of him.