ONE: 하이스쿨 히어로즈

이정하

Kim Eui-gyeom

김도완

Kang Yoon-ki

Kim Sang-ho

Kim Seok-tae

Kim Joo-ryoung

Myeong Da-bin

신준섭

Nam Seung-Sik

이찬형

Sung-Wook

신재휘

Lee Ki-Yoon

임성균

Kim Seung-joon

육준서

Lee Geol-jae

Yoo Hee-je

Choi Ki-soo

Lim Hyun-tae

Choi Hong-il

Hong Min-gi

Kim Nam-hyeop

신현수

Kim Su Gyeom [Eui Gyeom's brother]

Ha Min

Kim Ui-gyeom Aunt (Eps 3)