Full cast of School 2021

Kim Yo-han

Gong Ki-joon

16 episodes

Cho Yi-hyun

Jin Ji-won

16 episodes

Choo Young-woo

Jung Young-joo

16 episodes

Hwang Bo-reum-byeol

Kang Seo-young

16 episodes

Kim Kang-min

Ji Ho-sung

16 episodes

Seo Hee-sun

Go Eun-bi

16 episodes

Kim Nu-rim

Jong-bok

16 episodes

Lee Sang-jun

Lee Jae-hyeok

16 episodes

Kim Ye-ji

Jin Ji-soo

16 episodes

Cha Joo-wan

Choi Tae-gang

16 episodes

Lee Ha-eun

Jung Min Seo

16 episodes

Ko Eun-min

Kim Young-na

16 episodes

Ahn Se-min

Music Programme MC

16 episodes

Jang Seon-yul

Gong Ki-joon (child)

4 episodes

Hwang Sung-bin

Wan Jae / Eun Ki

2 episodes