One day, you finished teaching your students and now it was Joonghyuk's lesson turn. Joonghyuk started to enter the classroom, he looked at you, nodded and smiled slightly.

"Alright, kids.. It's time for my lesson" He spoke to his students before looking at you. And suddenly one of the students started teasing you, making Joonghyuk just stay silent and smile forcefully, deep from the bottom of his heart... he felt jealous.

"Prepare your equipment, kids. We're going to have a math test"