Kim Gyu-ri

as Min-ah

Park Ye-jin

as Hyo-shin

Rie Young-zin

as Shi-eun

Gong Hyo-jin

as Ji-won

Kim Jae-in

as Yeon-an

Baek Jong-hak

as Go Hyeong-seok

Maeng Bong-hak

as Biology Teacher

Lee Hyun-soon

as Teacher

Jung Jin-gak

as Vice Principal

Kim Kyeong-jin

as Group of Singer

Lee Hye-mi

as Student

Shin Hye-jung

as Classmate

Han Seung-yeon

as Class Leader

Lim Seong-eon

as Athletics Member

Ku Hye-ju

as Athletics Captain

Oh Min-ae

as School nurse

Han Min

as Shi-eun's friend

Jeon Gi-gwang

as Coach

Kang Min-kyung

as Classmate