Decoy: Part 1

Director

• 
  Kim Hong Seon

Screenwriter

• 
  Kim Jin Wook

Main Role

• 
  Jang Keun Suk

  Koo Do Han

  Main Role
• 
  Heo Sung Tae

  Noh Sang Cheon

  Main Role
• 
  Lee Elijah

  Jeon Na Yeon

  Main Role

Support Role

• 
  Yoo Sung Joo

  Park Sang Do

  Support Role
• 
  Lee Sung Wook

  Kang Jong Hoon

  Support Role
• 
  Park Myung Hoon

  Song Young Jin

  Support Role
• 
  Oh Yeon Ah

  Jung So Ram

  Support Role
• 
  Lee Seung Joon

  Lee Byung Joon

  Support Role
• 
  Lee Won Jong

  Kim Yeon Gwang

  Support Role
• 
  Baek Seung Ik

  Detective Park

  Support Role
• 
  Park Kyung Soon

  Detective Shin

  Support Role
• 
  Shin Jung Man

  Han Sung Bo

  Support Role
• 
  Lee Tae Geom

  [Section chief]

  Support Role
• 
  Hwang Jae Yeol

  Detective Jung

  Support Role
• 
  Lee Do Goon

  Jo Yoon Bae [Detective]

  Support Role
• 
  Seo Jung Yeon

  [Jung Na Yeon's mother]

  Support Role
• 
  Woo Hyun

  Kim Sang Bong

  Support Role
• 
  Lee Seung Bi

  Chung Joo Daek

  Support Role
• 
  Son In Yong

  [Jung Na Yeon's father]

  Support Role
• 
  Park Sung Yun

  Han Da Jung

  Support Role
• 
  Jung Chan Hoon

  Vice Commissioner Seo

  Support Role
• 
  Kim Tae Hyeong

  Jung Jae Hwang

  Support Role
• 
  Kim Dan Yool

  [Editor]

  Support Role
• 
  Park Seung Yeon Support Role

Guest Role

• 
  Kim In Kwon

  [Employee] (Ep. 1)

  Guest Role
• 
  Choi Seong Hyuk

  [Chinese restaurant deliveryman] (Ep. 1)

  Guest Role
• 
  Kwon Hye Ryung

  [Emergency 112 call center] (Ep. 1-2)

  Guest Role
• 
  Lee Su Hyung

  [Surgeon] (Ep. 2)

  Guest Role
• 
  Baek In Kwon

  [Prisoner 1] (Ep. 2)

  Guest Role
• 
  Kim Han Su

  [Prisoner 2] (Ep. 2)

  Guest Role
• 
  Park No Kyeong

  [Prisoner 3] (Ep. 2)

  Guest Role
• 
  Jeon Jae Hong

  Park Kyung Dong (Ep. 2-3)

  Guest Role
• 
  Park Wan Kyu

  Park Gwang Sin [Councilman] (Ep. 2-3)

  Guest Role
• 
  Park Yoon Hee

  Kim Sung Dae (Ep. 3)

  Guest Role
• 
  Jeong Seung Wook

  [Reporter] (Ep. 3)

  Guest Role
• 
  Cha Shin Tae

  [Detective] (Ep. 3)

  Guest Role
• 
  Kim Ki Nam

  [KCSI technician] (Ep. 3)

  Guest Role
• 
  Kwon Hae Sung

  [Gyeongcheon detective] (Ep. 3, 5)

  Guest Role
• 
  Lee Gyu Ho

  Choi Jang Tae (Ep. 4)

  Guest Role
• 
  Sim So Yeon

  [Doctor] (Ep. 4)

  Guest Role
• 
  Jung Ja Young

  [Dentist] (Ep. 4)

  Guest Role
• 
  Song Hoon

  CEO Oh (Ep. 5)

  Guest Role
• 
  Lee Dong Soo

  Prosecutor Go (Ep. 5)

  Guest Role
• 
  Kim Hyo Jin

  [Jung Jae Hwang's mother] (Ep. 5-6)

  Guest Role
• 
  Lee Suk

  Bang Hyun Min (Ep. 6)

  Guest Role
• 
  Lee Dong Gyu

  [Broadcaster] (Ep. 6)

  Guest Role
• 
  Oh Cho Hee

  [Famous entertainer] (Ep. 6)

  Guest Role
• 
  Kim Jung Jin

  [Detective] (Ep. 3)

  Guest Role
• 
  Moon Do Yun

  [Medical examiner] (Ep. 6)

  Guest Role
• 
  Kim Da Han Guest Role
• 
  Kim Han Soo

  [Prisoner] (Ep. 2)

  Guest Role
• 
  Yoo Dok Hyun

  [Detective #2] (Ep. 3)

  Guest Role
• 
  Lee Ye Ji

  [Kang Go Eun] (ep.3)

  Guest Role

Bit part

• 
  Kim Mi Suk

  [Victim]

  Bit part