Han Suk-kyu

Master Kim (Kim Sabu) / Dr. Boo Yongjoo

Ahn Hyo-seop

Seo Woojin

Lee Sung-kyoung

Cha Eunjae

Kim Joo-heon

Park Mingook

Shin Dong-wook

Bae Moonjeong

So Joo-yeon

Yoon Ahreum

Yoon Na-moo

Jeong Insoo

Jin Kyung

Oh Myeongshim

Im Won-hee

Jang Gitae

Byun Woo-min

Nam Doil

Kim Min-jae

Park Euntak

Lee Kyu-ho

Mr. Goo Hwangwoo (Doldam Hospital's orderly)

Jeong Ji-an

Uhm Hyeonjeong (ER expert at Doldam Hospital)

Ko Sang-ho

Yang Hojoon

Yoon Bo-ra

Joo Youngmi (Nurse at Doldam Hospital)

Lee Kyung-young

Cha Jinman

Lee Sin-young

Jang Donghwa

Kim Yong-jin

Chief Lee (Chief of Administration at Doldam Hospital)

Lee Hong-nae

Lee Seonwoong

Park Jin-ah

Hyeon Jihyeong

Lee Ji-ha

Eunjae's mother

Seo Dong-won

Sung Ryung

Jeong Han-seol

Seong Yoon