Full cast of Idol I

Sooyoung Choi

Maeng Se-na

12 episodes

Kim Jae-young

Do Ra-ik

12 episodes

Choi Hee-jin

Hong Hye-joo

12 episodes

Kim Hyun-jin

Park Chung-jae

12 episodes

Jeong Jae-kwang

Gwak Byeong-gyun

12 episodes

Park Jeong-woo

Choi Jae-hee

12 episodes

Choi Keon

Lee Young-bin

2 episodes

Jeong Man-sik

Geum Bo-sang

2 episodes

Jo Hyun-sik

Do Ra-ik's Manager

2 episodes

Kim Won-hae

Cheon Gwang-soo

2 episodes

Oh Jung-hwan

Manager Lee

2 episodes

Park Yong

Judge

1 episode

Hong Dal-pyo

Protestor

1 episode

An Woo-yeon

Kang Woo-seong

1 episode