Doctor Detective

Director

• 
  Park Joon Woo

Screenwriter

• 
  Song Yoon Hee

Main Role

• 
  Park Jin Hee

  Do Joong Eun

  Main Role
• 
  Bong Tae Gyu

  Heo Min Ki

  Main Role
• 
  Lee Ki Woo

  Choi Tae Young

  Main Role

Support Role

• 
  Park Ji Young

  Gong Il Soon [Director of the Center for Unidentified Diseases]

  Support Role
• 
  Lee Young Jin

  Byun Jung Ho [UDC Chief of Nursing]

  Support Role
• 
  Ryu Hyun Kyung

  Choi Min [TL Medical Center Pathology Resident]

  Support Role
• 
  Fujii Mina

  Seok Jin Yi [UDC chief of analyzing]

  Support Role
• 
  Jung Kang Hee

  Ha Jin Hak [UDC Chemical team leader]

  Support Role
• 
  Bae Noo Ri

  Park Hye Mi

  Support Role
• 
  Lee Chul Min

  General Manager Kwon [Chairman Choi Gon's right-hand man]

  Support Role
• 
  Choi Kwang Il

  Mo Sung Kook [TL Osem Head of Department]

  Support Role
• 
  Lee Young Suk

  Teacher Ko [UDC Industrial hygienist]

  Support Role
• 
  Chae Yoo Ri

  Choi Seo Rin [Tae Young & Jung Eun's daughter]

  Support Role
• 
  Park Joo Hyung

  Im Gook Shin

  Support Role
• 
  Kwon Hyuk Bum

  Kim Do Hyung

  Support Role
• 
  Park Geun Hyung

  Choi Kon [TL Group Chairman and Choi Tae Yeong and Choi Min's father]

  Support Role
• 
  Jung Soon Won

  Team Leader Jung

  Support Role
• 
  Shin Dam Soo

  Department Head Go

  Support Role
• 
  Cha Soon Bae

  [Bureau Director]

  Support Role
• 
  Jo Hyun Do

  Heo Min Gi

  Support Role
• 
  Park Jin Soo

  Si Young

  Support Role
• 
  Noh Haeng Ha

  Kim Yang Hee

  Support Role
• 
  Park Sung Joon Support Role
• 
  Jung Min Joon Support Role

Guest Role

• 
  Kwak Dong Yeon

  Jung Ha Rang [Do Jung Eun's neighbor, a man in charge of mending screen doors] (Ep. 1)

  Guest Role
• 
  Shin Hee Gook

  Seo Jae Young (Ep. 2)

  Guest Role
• 
  Kim Sang Kyoon

  Park Sang Kyoon (Ep. 5)

  Guest Role
• 
  Oh Dong Min

  Dong Min Woo [President Baker] (Ep. 5-6)

  Guest Role
• 
  Kim Si Ha

  [Child in Intensive Care Unit] (Ep. 12)

  Guest Role
• 
  Hwang Jung Min

  [Jung Ha Rang's mother]

  Guest Role
• 
  Yoon So Yi

  Yoon Si Wol

  Guest Role
• 
  Lee Woo Joo

  [Suit man]

  Guest Role
• 
  Lee Da Hae

  [Girlfriend]

  Guest Role
• 
  Kim Mi Hye

  [SBC reporter]

  Guest Role
• 
  Lee Jung Eun Guest Role
• 
  Moon Tae Yu Guest Role
• 
  Park Sung Jun Guest Role
• 
  Lee Su Min

  [Union member]

  Guest Role
• 
  Min Hye Su Guest Role
• 
  Ji Soo Han

  Kim Dae Ho

  Guest Role

Unknown

• 
  Lee So Yeong Unknown
• 
  Lee Ji Young Unknown
• 
  Dok Ko Kwang Unknown
• 
  Kim Hyeon Tae Unknown
• 
  Ha Min Unknown