Duel

Composer

• 
  Eom Ki Yeop

Director

• 
  Lee Jong Jae

Screenwriter

• 
  Kim Yoon Joo

Main Role

• 
  Jung Jae Young

  Jang Deuk Cheon

  Main Role
• 
  Kim Jung Eun

  Choi Jo Hye

  Main Role
• 
  Yang Se Jong

  Lee Sung Joon | Lee Sung Hoon | Dr. Lee Yong Sup

  Main Role
• 
  Seo Eun Soo

  Ryoo Mi Rae

  Main Role

Support Role

• 
  Kim Ki Doo

  Kim Ik Hong [Journalist]

  Support Role
• 
  Yoon Kyung Ho

  Lee Hyung Sik [Jeongbuk Police Homicide detective / Deuk Cheon's junior]

  Support Role
• 
  Choi Woong

  Na Soo Ho [Jeongbuk Police Homicide detective]

  Support Role
• 
  Lee Na Yoon

  Jang Soo Yeon [Deuk Cheon's daughter]

  Support Role
• 
  Jo Jae Ryong

  Jin Byung Joon [Prison medical director]

  Support Role
• 
  Shim Wan Joon

  Yang Man Choon

  Support Role
• 
  Lee Ye Eun

  Na Song Yi [Jo Hye's prosecutor office investigator]

  Support Role
• 
  Lee Chul Min

  Park Yoo Shik

  Support Role
• 
  Jo Soo Hyang

  Park Seo Jin

  Support Role
• 
  Lee Sung Wook

  Koo Bon Suk [Jo Hye's prosecutor office investigator]

  Support Role
• 
  Lee Hae Young

  Park Dong Sool

  Support Role
• 
  Choi Kwang Je

  Head of Department Baek

  Support Role
• 
  Kim Ji Yoo

  Ahn Hye Joo

  Support Role
• 
  Kang Min Tae Support Role
• 
  Park Tae San Support Role
• 
  Jo Jae Wan

  Choi Joo Sik

  Support Role
• 
  Kim Bo Jung

  Ryoo Jeong Sook [Mi Rae's mother / Former nurse]

  Support Role
• 
  Jang Liu

  [Yang Man Choon's subordinate]

  Support Role
• 
  Kim Kwang Sub

  [Yang Man Choon's subordinate]

  Support Role
• 
  Kang Ji Hoo

  Park Seo Ryong

  Support Role
• 
  Kim Nan Hee

  Kim Hye Jin

  Support Role
• 
  Lim Il Gyu

  Cha Kil Ho

  Support Role

Guest Role

• 
  Song Joon Hee

  Lee Sung Joon [Young] | Lee Sung Hoon [Young]

  Guest Role
• 
  Yoo Ha Bok

  [Member of board Han]

  Guest Role
• 
  Jung Dong Gyu

  Woo Byeong Cheon [Chief public prosecutor]

  Guest Role
• 
  Joo Boo Jin

  [Jang Deuk Cheon's landlady "voice appearance"]

  Guest Role
• 
  Park Ji Il

  Park San Yeong

  Guest Role
• 
  Uhm Soo Jung

  Han Yoo Ra

  Guest Role
• 
  Choi Bum Ho

  [Jang Soo Yeon's doctor]

  Guest Role
• 
  Joo Seok Tae

  Ahn Jung Dong [Kidnapped child Hye Joo's father]

  Guest Role
• 
  Ha Ji Eun

  [Hye Joo's mother]

  Guest Role
• 
  Gam So Hyun Guest Role
• 
  Kim Young Hee Guest Role
• 
  Cho Yi Hyun Guest Role
• 
  Lee Seung Jun

  [Duty doctor]

  Guest Role
• 
  Yoon Byung Hee Guest Role
• 
  Yoon Hee Won Guest Role
• 
  Kim Soo Hong Guest Role
• 
  Kim Dae Hyun Guest Role
• 
  Park Seong Kyun Guest Role
• 
  Oh Chang Kyung Guest Role
• 
  Yoon Jong Goo Guest Role
• 
  Baek In Kwon Guest Role
• 
  Kang Tae Shik Guest Role
• 
  Lee Soon Won Guest Role
• 
  Kwon Ban Suk

  [Researcher]

  Guest Role
• 
  Jin Geun Ho

  [Nurse]

  Guest Role
• 
  Heo Woong Guest Role
• 
  Kim Bum Suk Guest Role
• 
  Jung Yun Ha

  [Nurse]

  Guest Role
• 
  Lee Seo Joon Guest Role
• 
  Kim Si Eun

  Joo Ah

  Guest Role
• 
  Kim Jung Han

  [Homeless man]

  Guest Role

Unknown

• 
  Keum Dong Hyun Unknown
• 
  Hong Jung Ho Unknown
• 
  Lee Gyu Sub Unknown
• 
  Son Sung Chan Unknown
• 
  Bae Eun Woo Unknown
• 
  Choi Won Yong Unknown
• 
  Han Sang Kyung

  [Gang member 3] (Ep.5)

  Unknown
• 
  Kim Je Yeol Unknown
• 
  Min Hyo Kyung Unknown