Lee Se-young
Role: Kang Shi-Young
Oh Hyun-Joong
Role: Kim Won Hee
Lee Kyoo-hyung
Role: Son Seok-Ki
Kim Hye-eun
Role: Tae-Kyung
Shin Dong-mi
Role: Chae Eun-Jung
Jeon No-min
Role: Kang Yi-Soo
Uhm Hyo-seop
Role: Kang Yi-Moon
Oh Seung-hyun
Role: Min Joo-Kyung
Jeong In-gi
Role: Jung-Nam
Hwang Hee
Role: Lee Yoo-jun
Jung Min-ah
Role: Kang Mi-Rae
Chun Young-min
Role: Lee Da-hae
Kwon Hwa-woon
Role: Heo Joon
Son San
Role: Hong Yun Jin
Lee You-mi
Role: Na Kyung Ah
Kim Yeong-hoon
Role: Han Myung Oh
Jeong Jae-seong
Role: Kwon Suk
Yoon Joo-Sang
Role: Lee Won Gil
Jung Kyung-soon
Role: Yoo Joon's mother
Park Jin-young
Role: Nurse
Kim Mi-hye
Role: Questioner
Noreen Joyce Guerra
Role: Flight attendant
Moon Hak-jin
Role: Kim Jung Ho [3rd-year Resident Ophthalmology]
Jang Hee-soo
Role: Professor of Anesthesiology and Pain Medicine
Yoon Chan-young
Role: Lee Ki Suk (A CIPA patient)
Oh Yoo-na
Role: Yoo Ri Hye [former actress who suffers from neuroblastoma]
Yoon Joo-Sang
Role: Lee Won Gil [Former Minister of Health and Welfare]
Lim Dong-jin
Role: Shim Joon Chul
고용화
Role: Lee Ki Suk's mother
Lee Yo-seong
Role: Cha Yo Han's father
Jung Ji-hoon
Role: Min Sung [Yoo Ri Hye's son]
Park Si-wan
Role: Cha Yo Han (child)
Kim Seung-hyun
Role: Inmate