On screen
Cast
31 credited performers
Lee Hyun-woo
Kang Han-Kyeol
JOY
Yoon So-Rim
Choi Min-soo
Kang In-Woo
Lee Jung-jin
Choi Jin-Hyuk
Kim In-kwon
Homeroom Teacher
Im Ye-jin
Kim Soon-Hee
Lee Seo-won
Seo Chan-Young
Sung Joo
Yoo Shi-Hyun
Hong Geum-bi
Chae Yoo-Na
Song Kang
Baek Jin-Woo
Jang Ki-yong
Ji In-ho
Lee Su-ryeon
Reporter
Jung Yoo Geun
Kang Han-Kyeol (child)
Lee Yoo-jun
[sound engineer]
Lee Seo Hyeon
Yoon So-Rim (child)
Kang Woo-je
[Yoo Hyun Jung's assistant]
Kim Yong-geon
[Yoo Hyun Jung's father, chairman Who Entertainment]
Park Jong-hyuk
Lee Kyoo Sun
신제민
Lee Yoon
Yoo Joo-won
Lee Kyoo Sun (young)
Kim Min-seok
Koo Joon Seok
Lee Hye-bin
Trainee
Yeon Woo
Trainee
Kim Na-yun
Trainee
Park Hae-soo
Bass player
Yang Kyung-won
[director of the competition]
Lee Jun Yong
[ member boy group from show "Produce 20"]
Lee Sang Ho
[ member boy group from show "Produce 20"]
Go Bon Kuk
[ member boy group from show "Produce 20"]
Han Jae Un
[ member boy group from show "Produce 20"]
Kim Ji-woong
[ member boy group from show "Produce 20"]