Casts
Kim Ha-neul
as Hyo-joo
Yoo In-young
as Hae-young
Lee Won-keun
as Jae-ha
Lee Hee-jun
as Pyo Sang-woo
Gi Ju-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
Lee Kyung-young
as Chairman