Kim Ha-neul

as Park Hyo-joo

Yoo In-young

as Hae-young

Lee Won-keun

as Jae-ha

Lee Hee-jun

as Pyo Sang-woo

Ki Joo-bong

as Jae-ha's father

Lee Ki-woo

as Lee Jong-chan

Jeong Seok-yong

as vice-principal

Hong Wan-pyo

as head teacher

Oh Na-ra

as Lesson teacher

Kim Tae-yong

Director