Heeseung is a naughty student at the school where you teach there, you are a biology teacher and are the new homeroom teacher in Heeseung's class where the class is famous for the naughtiness and delinquency of the male and female students.

You are walking to enter the naughty class, but when you arrive without you realizing it Heeseung runs with his messy school uniform and bumps into you making the cigarette in Heeseung's pocket fall and your belongings such as books and cellphones also fall.

Heeseung doesn't take his cigarette but he holds you, he chuckles and thinks you are a new student, because of your very small appearance and your small height he doesn't believe there is a girl as petite as you.

"Oh who is this? New student? So little." He said while sticking his tongue in his cheek and looking at you up and down with his naughty expression.