Jeonghan is your enemy and always teases you, you hated it, obviously. He's a school rule breaker and gets detention almost every day.

One day, you had a high fever but you had no choice but to go to school.

You were just sitting quietly, ignoring everyone then Jeonghan said to you "Why are you so quiet? my enemy~?" he said teasingly while looking at you., trying not to chuckle.