Doctor John

Composer

• 
  Mun Seong Nam

Director

• 
  Jo Soo Won
• 
  Kim Young Hwan

Screenwriter

• 
  Kim Ji Woon

Main Role

• 
  Ji Sung

  Cha Yo Han

  Main Role
• 
  Lee Se Young

  Kang Shi Young

  Main Role
• 
  Lee Kyu Hyung

  Son Suk Ki

  Main Role
• 
  Hwang Hee

  Lee Yoo Joon

  Main Role

Support Role

• 
  Jung Min Ah

  Kang Mi Rae

  Support Role
• 
  Kwon Hwa Woon

  Heo Joon [4th year Resident]

  Support Role
• 
  Son San

  Hong Yun Jin [Nurse - Pain Clinic]

  Support Role
• 
  Lee You Mi

  Na Kyung Ah [Nurse - Pain Clinic]

  Support Role
• 
  Kim Hye Eun

  Min Tae Kyung [Shi Young's mother / Chief - Anesthesiology and Pain Medicine]

  Support Role
• 
  Kim Young Hoon

  Han Myung Oh [Hospital's Legal Adviser]

  Support Role
• 
  Um Hyo Sup

  Kang Yi Moon [Shi Young's uncle / Director - Seoul Hansae Hospital]

  Support Role
• 
  Oh Seung Hyun

  Min Joo Kyung [Shi Young's aunt / Anesthesiology Professor]

  Support Role
• 
  Jung Jae Sung

  Kwon Suk [Anesthesiology professor]

  Support Role
• 
  Jeon Noh Min

  Kang Yi Soo [Shi Young's father]

  Support Role
• 
  Shin Dong Mi

  Chae Eun Jung [Nurse]

  Support Role
• 
  Jung In Ki

  Oh Jung Nam [Shi Young's uncle / Prison Warden]

  Support Role
• 
  Oh Hyun Joong

  Kim Won Hee [1st year Resident]

  Support Role
• 
  Yoon Joo Sang

  Lee Won Gil [Frm. Minister of Health and Welfare]

  Support Role
• 
  Jung Kyung Soon

  [Yu Jun's mother]

  Support Role
• 
  Lim Jung Min

  [Ophthalmology Professor]

  Support Role
• 
  Lee Shin Sung

  Jeong Chan Seok

  Support Role

Guest Role

• 
  Park Shi Wan

  Cha Yo Han [Young]

  Guest Role
• 
  Kim Do Hoon

  Park Jung Bo [Prisoner] (Ep. 1-4, 23)

  Guest Role
• 
  Geum Bo

  [Fishbone inmate] (Ep.1)

  Guest Role
• 
  Lee Seung Chul

  [Inmate 6124] (Ep. 1)

  Guest Role
• 
  Ha Do Kwon

  Joo Hyung Woo [Mixed Martial Arts Champion] (Ep.5-8, 28)

  Guest Role
• 
  Jung Hyun Seok

  [Hyung Woo’s doctor] (Ep. 5)

  Guest Role
• 
  Ha Kyung Min

  [Hyeong U’s doctor] (Ep. 5)

  Guest Role
• 
  Kim Jong Goo

  [Hyung Woo's father] (Ep. 7)

  Guest Role
• 
  Choi Eun Hoo

  [Hyung Woo’s son] (Ep.7)

  Guest Role
• 
  Jo Si Yeon

  [Hyung Woo’s daughter] (Ep.7)

  Guest Role
• 
  Jung Ae Yeon

  [Hyung Woo's wife]

  Guest Role
• 
  Sung Chan Ho

  [Doctor] (Ep.9)

  Guest Role
• 
  Son Hee Soon

  [Guardian on elevator] (Ep.9)

  Guest Role
• 
  Choi Min Geum

  [Pain Clinic] (Ep.10)

  Guest Role
• 
  Lee Joo Won

  Choi Seung Won [Patient in constant pain] (Ep.10)

  Guest Role
• 
  Han Tae Il

  [Bumps into man in Pain Clinic] (Ep.10)

  Guest Role
• 
  Yoon Chan Young

  Lee Gi Seok [CIPA Patient] (Ep. 10-12, 24-28)

  Guest Role
• 
  Oh Yoo Na

  Yoo Ri Hye [Actress] (Ep.11)

  Guest Role
• 
  Cheon Young Min

  Lee Da Hae [Phantom limb patient] (Ep. 13-16)

  Guest Role
• 
  Lee Do Kyung

  Yoo Duk Gyu [Melioidosis Patient] (Ep.7, 13-14, 28)

  Guest Role
• 
  Kim Joo Ryoung

  Park Hyun Sook [‘Death talk’ attendee] (Ep.15-23)

  Guest Role
• 
  Im Byung Ki

  [‘Death talk’ discussion leader] (Ep.16)

  Guest Role
• 
  So Hee Jung

  [Yoo Ri Hye's sister] (Ep.17-20)

  Guest Role
• 
  Choi Yoon Joon

  [Patient looking only for Cha Yo Han] (Ep.27)

  Guest Role
• 
  Shin Shin Beom

  [Patient thankful to Cha Yo Han] (Ep.27)

  Guest Role
• 
  Joey Albright

  Lucas Smith [Doctor] (Ep. 31)

  Guest Role
• 
  Seo Yoon Ah

  [Abdominal epilepsy patient] (Ep. 31-32)

  Guest Role
• 
  Moon Hak Jin

  Kim Jung Ho [3rd-year Resident Ophthalmology]

  Guest Role
• 
  Ham Sung Min

  Yoon Sung Kyu [Kidnapper / Cancer patient]

  Guest Role
• 
  Kim Kyul

  Sung Dong Ho [Anesthesiology Professor]

  Guest Role
• 
  Im Dong Jin

  Shim Joon Chul [Professor of Neurology]

  Guest Role
• 
  Jung Ji Hoon

  Min Sung [Yoo Ri Hye's son]

  Guest Role
• 
  Shim Hye Yun

  Jung In [Eun Jung's daughter]

  Guest Role
• 
  Lee Se Rang

  Kwon So Young

  Guest Role
• 
  Ham Na Young

  Choi Seul A [Choi Seung Won's daughter]

  Guest Role
• 
  Nam Sang Hee

  Soo Jin [Child with Pediatric Diabetes]

  Guest Role
• 
  Kang Ro Chae

  Han Min Joo

  Guest Role
• 
  Jang Hee Soo

  [Anesthesiology Professor]

  Guest Role
• 
  Kim Seung Hoon

  [Prison guard]

  Guest Role
• 
  Yoon In Jo

  [Patient Choi Seung Won's wife]

  Guest Role
• 
  Shin Yeon Suk

  [Patient Yoon Sung Kyu's guardian]

  Guest Role
• 
  Kim Hyo Kyung

  [Child with Diabetes]

  Guest Role
• 
  Yoon Jong Goo

  [Prison guard]

  Guest Role
• 
  Lee Yo Sung

  [Cha Yo Han's father]

  Guest Role
• 
  Kwon Oh Jin

  [Park Jung Bo’s father]

  Guest Role
• 
  Ha Soo Ho

  [Joo Hyung Woo’s Manager]

  Guest Role
• 
  Go Yong Hwa

  [Lee Gi Suk's mother]

  Guest Role
• 
  Kim Sa Hun

  [Emergency Room Doctor]

  Guest Role
• 
  Yong Jin

  [Prisoner]

  Guest Role
• 
  Park Mi Ri

  [Nurse]

  Guest Role
• 
  Lee Min Sik Guest Role
• 
  Lee Ah Jin

  [Mother of child with pediatric diabetes]

  Guest Role
• 
  Park Jin Young

  [Nurse]

  Guest Role
• 
  Park Si Won Guest Role
• 
  Kim Jung Hwan

  Ahn Seung Hyun [Reporter] (Ep. 8)

  Guest Role
• 
  Kwak Gi Hun

  [Prisoner]

  Guest Role
• 
  Noreen Joyce Guerra

  [Flight attendant]

  Guest Role
• 
  Moon Joo Won

  Lee Yoo Joon [Young]

  Guest Role
• 
  Kim Ah Ram

  [Guardian of elderly patient that dies in ICU]

  Guest Role
• 
  Kim I San

  [Husband]

  Guest Role
• 
  Kim Seung Hyun

  [Inmate]

  Guest Role
• 
  Jun Eun Mi

  [Restaurant owner]

  Guest Role
• 
  Ahn Jae Jun

  [Guardian]

  Guest Role
• 
  Jeon Jeong Il

  [Middle-aged son]

  Guest Role
• 
  Jang Yu Jin

  Major

  Guest Role
• 
  Park Jung Eon

  Chae Eun Jung's older sister (ep.13)

  Guest Role
• 
  Choi Yo Woon

  [Head nurse]

  Guest Role
• 
  Lee Dong Gyu

  [Reporter]

  Guest Role
• 
  Park Hyun Jeong

  [Girl's mother]

  Guest Role
• 
  Shin Hee Gook

  [Intern]

  Guest Role
• 
  Kwak Na Yeon

  [Lobby scene]

  Guest Role
• 
  Kim Shi Woo

  [Photograph boy]

  Guest Role
• 
  Ahn Dong Yeob

  (Ep. 1)

  Guest Role
• 
  Lee Chang Won Guest Role
• 
  Seo Soo Min

  [Bookstore clerk]

  Guest Role
• 
  Kim Jung Han

  [Prisoner]

  Guest Role
• 
  Kim Mi Hye

  [Questioner]

  Guest Role

Unknown

• 
  Kim Yeon Ji Unknown
• 
  Park Kyung Bok Unknown
• 
  Kim Shin Yul Unknown
• 
  Park Jin Soo Unknown
• 
  Kim Yong Seok Unknown
• 
  Byun Yoon Jeong Unknown
• 
  Jung Min Seok Unknown
• 
  Kim Young Hee Unknown
• 
  Choi Min Seo Unknown
• 
  Kim Min Seok Unknown

Bit part

• 
  Andreas Fronk

  UFC Fighter

  Bit part