Minhyun

as Yoon Ga-min

10 episodes

Park Yoon-ho

as Lee Hyun-woo

10 episodes

Cha Woo-min

as Phi Han-wool

10 episodes

Shin Su-hyun

as Lee Ji-woo

10 episodes

Hong Min-gi

as Park Geon-yeop

10 episodes

Lee Jong-hyun

as Kim Se-hyeon

10 episodes

Han Ji-eun

as Lee Han-kyung

10 episodes

Yun Sang-jeong

as Choi Hee-won

10 episodes

Gong Do-yu

as Lee Jun

10 episodes

Baek Seo-hoo

as Ma Min-hwan

10 episodes

Lee Gwang-hee

as Jeong Do-hoon

10 episodes

Kim Young-ah

as Jeon Mi Hyun

10 episodes

Jeong Jae-seong

as vice-principal (Yu-seong Tech)

10 episodes

Joo Yeon-woo

as Kim Soon-cheol

10 episodes

Cho Seung-yeon

as dean of academic affairs (Yu-seong Tech)

10 episodes

Jin Woo-jin

as Kim Gyu-Jin [Disciplinary Committee member]

10 episodes

Choi Ye-chan

10 episodes

Kim Min-ah

as Hwang Mi-Hee (Yu-seong Tech)

10 episodes

Lee Dong-Hoon

as Seo Yoo-bi

10 episodes

Kim Hwi-gyu

as No. 173

10 episodes