Ji Chang-wook

Yoon Gyeo-rea

Sooyoung Choi

Seo Yeon-joo

Sung Dong-il

Kang Tae-sik

Won Ji-an

Ha Jun-kyung

Nam Tae-hoon

Jang Seok-jun

Yang Hee-kyung

Yeom Soon-ja

Kil Hae-yeon

Choi Deok-ja

Yoo Soon-woong

Hwang Cha-yong

Jeon Chae-eun

Yoo Seo-jin

Shin Ju-hwan

Yang Chi-hun

Park Se-jun

Wang Jin-gu

Park Jin-joo

Se Hee

Min Woo-hyuk

Pyo Gyu-Tae

Kang Chae-min

Dong Ho [Hye Jin's son]

Han Sa-myeong

Cheol Min [Gyu Tae's Manager]

Jin Mo

Musical director

Lee Gyu-young

Audition security staff

Kim Si-eun

Kang Soo-Jin

Kim Bong-soo

Patient

Lee You-mi

New volunteer

Woo Kang-min

Fitness Instructor

Choi Seo-yoon

Hee-sook (Eps 3)

Kim Yong-wan

Director

Jo Ryeong-soo

Writer