김하늘
— Park Hyo-joo
Yoo In-young
— Hae-young
이원근
— Jae-ha
이희준
— 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
Kwak Dong-yeon
— Yoo Jong-Ki
Im Hwa-young
— Lee Yoon-mi
Kim Su-jin
— Teacher
Lee Chung-hee
— Teacher
옥지영
— Kim Na-yeon