Ahn Jae-hong as Kang Yang-hyun

Lee Sin-young as Cheon Gi-beom

Jeong Jin-woon as Bae Gyu-hyuk

Kim Taek as Hong Sun-gyu

Jung Gun-joo as Jung Kang-ho

Kim Min as Heo Jae-yoon

Ahn Ji-ho as Jung Jin-wook

Lee Jun-hyeok as Teacher Lee

Kim Hoe-jin as Messy hair

Kim Soo-jin as Gyu-hyuk's Mother

Kang Ae-sim as Principal's Wife

Min Moo-je as Gi-beom's Father

Choi Jung-yoon as Gi-beom's Mother

Bae Seong-il as Teacher 1

Kang Shin-chul as Teacher 2

Yoo In-hye as Teacher 3

Song Chang-gyu as Teacher 4

Jang Hyun-sung as Yongsan High School Coach

Park Sang-myeon as 50s Man

Park Jae-min as Sportscaster

Lee Sang-won as Imho Middle School Coach

Baek Do-kyeom as Referee

Kim Won-shik as Jemulpo High School 7

Jeon Yeong as Doctor

Lee Tae-young as Police

Oh Hyeon-soo as Parent 1

Kang Hyun-oh as Lynch Student 1