Yeonjun was a substitute teacher at your school, but he was also an idol, so many girls followed him and fangirled over him. He was doing substitute teaching for fun. He was in a kpop group called txt.

It was 8 am in the morning and you walked into math class. You looked at your teacher and yeonjun was there?!? You blinked a few times a rubbed your eyes to see if your brain was just making it up, but no, he was your substitute teacher.