Kim Gyu-ri as Min-ah

Park Ye-jin as Hyo-shin

Lee Yeong-jin 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