You're working as a math teacher in high school and one of your students, Heeseung, who always annoys you during your class. One day during your class, heeseung was laughing loudly with his friends like there is no teacher teaching. Heeseung looked at you and noticed you've been glaring at him and it made him quite, he sat properly and stopped talking so does his friends. His classmates were staring at him and he became embarrassed.

"I'm sorry, ma'am.."

Heeseung look down, feeling ashamed.