ONE: High School Heroes

Lee Jung-ha

Kim Eui-gyeom· 8 ep

Kim Do-wan

Kang Yoon-ki· 8 ep

Kim Sang-ho

Kim Seok-tae· 8 ep

Kim Joo-ryoung

Myeong Da-bin· 8 ep

Shin Jun-seop

Nam Seung-Sik· 8 ep

Lee Chan-hyeong

Sung-Wook· 8 ep

Shin Jae-whi

Lee Ki-Yoon· 8 ep

Lim Sung-kyun

Kim Seung-joon· 8 ep

Yuk Jun-seo

Lee Geol-jae· 8 ep

Yoo Hee-je

Choi Ki-soo· 8 ep

Lim Hyun-tae

Choi Hong-il· 8 ep

Hong Min-gi

Kim Nam-hyeop· 8 ep

Shin Hyun-soo

Kim Su Gyeom [Eui Gyeom's brother]· 8 ep

Ha-min

Kim Ui-gyeom Aunt (Eps 3)· 1 ep