김하늘

Park Hyo-joo

Yoo In-young

Hae-young

이원근

Jae-ha

Lee Hee-jun

Pyo Sang-woo

기주봉

Jae-ha's father

이기우

Lee Jong-chan

정석용

vice-principal

홍완표

head teacher

Oh Na-ra

Lesson teacher

Lee Kyung-young

Chairman