Gap Dong

Composer

• 
  Mun Seong Nam

Director

• 
  Jo Soo Won
• 
  Shin Yong Hwi

Screenwriter

• 
  Kwon Eum Mi

Main Role

• 
  Yoon Sang Hyun

  Detective Ha Moo Yeom

  Main Role
• 
  Lee Joon

  Ryu Tae O

  Main Role
• 
  Kim Min Jung

  Oh Maria

  Main Role
• 
  Kim Ji Won

  Ma Ji Wool / "Matilda"

  Main Role
• 
  Sung Dong Il

  Yang Chul Gon [Chief detective]

  Main Role

Support Role

• 
  Jung In Ki

  Cha Do Hyuk

  Support Role
• 
  Kang Nam Gil

  Han Sang Hoon

  Support Role
• 
  Jang Gwang

  Jin Jo [Monk]

  Support Role
• 
  Jo Ji Hwan

  Lee Hyung Nyun [Detective]

  Support Role
• 
  Choo Soo Hyun

  Oh Young Ae [Detective]

  Support Role
• 
  Yoon Kyun Sang

  Yoon Kyun Sang [Detective]

  Support Role
• 
  Jang Hee Soo

  Kim Young Mi [Maria's mother]

  Support Role
• 
  Hong In Young

  Hong Sung Hee [Reporter]

  Support Role
• 
  Min Sung Wook

  Nam Gi Ri [Detective]

  Support Role
• 
  Jung Won Joong

  Park Jung Goo [Prosecutor]

  Support Role
• 
  Jang Hee Woong

  Seo Ji Hoon [Prosecutor]

  Support Role
• 
  Seo Joo Hee

  Ji Hwa Ja [Ji Wool's mother / Chicken restaurant owner]

  Support Role

Guest Role

• 
  Lee Young Eun

  Lee Soon Shim (Ep. 3)

  Guest Role
• 
  Woo Jung Kook

  Mr. Jo (Ep. 6)

  Guest Role
• 
  Jung Yoo Min

  Lee Jung Sook (Ep. 14)

  Guest Role
• 
  Lee Go Eun

  Seon Joo [Young]

  Guest Role
• 
  Hyun Woo

  Gap Dong [Young]

  Guest Role
• 
  Yoon Chan Young

  Ryu Tae O [Young]

  Guest Role
• 
  Jeong Jae Min

  Ha Moo Yum [Young]

  Guest Role
• 
  Jung Chan Bi

  Oh Maria / Kim Jae Hee [Young]

  Guest Role
• 
  Jung Da Woon

  Da Hye

  Guest Role
• 
  Sa Hee

  Jung Mi Ra

  Guest Role
• 
  Park Dong Bin

  Bae Sang Ki

  Guest Role
• 
  Yoo Eun Ho

  Yang Sun Joo

  Guest Role
• 
  Kim Min Sang

  Choi Tae Shik

  Guest Role
• 
  Jung Geun

  Park Ho Seok

  Guest Role
• 
  Lee Seung Ho

  Kim Shin Yong

  Guest Role
• 
  Ha Jun

  Na Do Hyeong

  Guest Role
• 
  Park Jung Woo

  Yoon [Team leader]

  Guest Role
• 
  Choi Min

  Peter Park [Tae O’s lawyer]

  Guest Role
• 
  Lee Su Ryeon

  [Victim]

  Guest Role
• 
  Choi Sung Jae

  [Detective]

  Guest Role
• 
  Lee Dong Jin

  [Psychiatrist]

  Guest Role
• 
  Jo Seung Yun

  [Tae Oh’s lawyer]

  Guest Role
• 
  Kim Ga Eun

  [High school student]

  Guest Role
• 
  Jang Young

  [Researcher]

  Guest Role
• 
  Jo Wang Byeol Guest Role
• 
  Park Yong Guest Role
• 
  Park Rosa Guest Role
• 
  Park Ji Yun Guest Role
• 
  Hwang In Jun Guest Role
• 
  Kim Kyung Nam Guest Role
• 
  Kim Jung Han

  [Paramedic]

  Guest Role

Unknown

• 
  Jang Hyun Jung Unknown