Trigger

Composer

• 
  Hwang Sang Jun

Screenwriter & Director

• 
  Kwon Oh Seung

Main Role

• 
  Kim Nam Gil

  Lee Do

  Main Role
• 
  Kim Young Kwang

  Moon Baek

  Main Role

Support Role

• 
  Woo Ji Hyun

  Yoo Jeong Tae [Student]

  Support Role
• 
  Park Hoon

  Koo Jeong Man [Boss’ backup handler]

  Support Role
• 
  Kim Won Hae

  Cho Hyeon Sik [Station chief]

  Support Role
• 
  Jang Dong Ju

  Jang Jeong U [Police officer]

  Support Role
• 
  Yang Seung Ri

  Kong Seok Ho [Glorypa boss]

  Support Role
• 
  Lee Seung Hee

  [Detective]

  Support Role

Guest Role

• 
  Kang Chae Young

  Park So Hyeon [Nurse] (Ep. 1, 8-10)

  Guest Role
• 
  Do Eun Bi

  Ko Ji Yeong [Water purifier coordinator] (Ep. 1)

  Guest Role
• 
  Kang Hak Soo

  [Detective] (Ep. 1)

  Guest Role
• 
  Hwang Bo Jeong Il

  [Room #308] (Ep. 1)

  Guest Role
• 
  Sun Woo Sun

  [Psychiatrist] (Ep. 1, 9)

  Guest Role
• 
  Carson Allen

  [Subway rider] (Ep. 1)

  Guest Role
• 
  Lee Seung Won

  [Subway seller] (Ep. 1)

  Guest Role
• 
  Hwang Jae Hoon

  [Hostel manager] (Ep. 1, 9-10)

  Guest Role
• 
  Kil Hae Yeon

  O Gyeong Suk [Min Ju's mom] (Ep. 1-3, 10)

  Guest Role
• 
  Lee Suk

  Jeo Won Sung [Sex offender] (Ep. 1-3)

  Guest Role
• 
  Kong Hyun Ji

  Cho Se Yeong [Hyeon Sik's daughter] (Ep. 1, 5, 8)

  Guest Role
• 
  Gu Hyun

  Lee Do [Child] (Ep. 2, 9)

  Guest Role
• 
  Yoo Byung Sun

  [Taxi driver] (Ep. 2)

  Guest Role
• 
  Cha Young Mi

  [Mart shopper] (Ep. 2)

  Guest Role
• 
  Song Kyung A

  [Mart shopper] (Ep. 2)

  Guest Role
• 
  Jang Yong Hee

  [Taxi passenger] (Ep. 2)

  Guest Role
• 
  Kim Dae Geun

  [Yong Gu’s subordinate] (Ep. 2)

  Guest Role
• 
  Jo Han Chul

  Captain Cho [Team chief] (Ep. 2-3)

  Guest Role
• 
  Kim Dae Gon

  Cho U Tae [Jeong Man's subordinate] (Ep. 2-3)

  Guest Role
• 
  Park Yoon Ho

  Park Gyu Jin [High school student] (Ep. 2, 6-7)

  Guest Role
• 
  Hong Min Gi

  Kang Seong Jun [High school student] (Ep. 2, 6-7)

  Guest Role
• 
  Son Bo Seung

  Seo Yeong Dong [High school student] (Ep. 2, 6-7)

  Guest Role
• 
  Shin Moon Sung

  Hwang Seok Min [Inspector] (Ep. 3, 9-10)

  Guest Role
• 
  Jeon Soo Ji

  [Situation room chief] (Ep. 3, 7)

  Guest Role
• 
  Nam Min Woo

  [Jeong Man's subordinate] (Ep. 3, 8)

  Guest Role
• 
  Shin Chang Joo

  [Jeong Man's subordinate] (Ep. 3, 8)

  Guest Role
• 
  Kim Hee Su

  [Jeong Man's subordinate] (Ep. 3, 8)

  Guest Role
• 
  Lee Gyu Ho

  [Jeong Man's subordinate] (Ep. 3, 8)

  Guest Role
• 
  Park Joo Young

  Ji Ung [Chauffeur] (Ep. 4)

  Guest Role
• 
  Ahn Se Ho

  Kim Deok Hyeon [Rival organization head] (Ep. 4)

  Guest Role
• 
  Yun Ki Chang

  [CEO] (Ep. 4)

  Guest Role
• 
  Han Sa Myung

  [Internal affairs investigator] (Ep. 4)

  Guest Role
• 
  Kim Nak Gyun

  [TV station manager] (Ep. 4)

  Guest Role
• 
  Kim Joong Hee

  Wang Dae Hyeon [Reporter] (Ep. 4, 7-10)

  Guest Role
• 
  Park Gwang Jae

  Yong Gu (Ep. 6)

  Guest Role
• 
  Song Yoo Hyun

  [Teacher] (Ep. 6)

  Guest Role
• 
  Jeon Kwang Jin

  [Student council president] (Ep. 6)

  Guest Role
• 
  Choi Bo Kwang

  Hong Seo Jeong [Gyu Jin's mother] (Ep. 6-7)

  Guest Role
• 
  Kim In Kwon

  [Parcel receiver] (Ep. 7)

  Guest Role
• 
  Foster Burden

  Jake (Ep. 8, 10)

  Guest Role
• 
  Jung Woong In

  Yun Won Cheol [Police chief] (Ep. 8)

  Guest Role
• 
  Park Jung Hak

  Kwon Deok Su [Commissioner General of Police] (Ep. 8)

  Guest Role
• 
  Lee Ji Hoon

  Su Ri Nam [Computer repair shop owner] (Ep. 8-10)

  Guest Role
• 
  Ko Sang Ho

  [NIS agent] (Ep. 8-10)

  Guest Role
• 
  Min Sung Wook

  [NIS team leader] (Ep. 8-10)

  Guest Role
• 
  Han Ji An

  [Child in protest] (Ep. 10)

  Guest Role
• 
  Park Geon Ju

  Kim Yeon Su

  Guest Role
• 
  Cha Rae Hyoung

  Seo Hyeong Ju

  Guest Role
• 
  Moon Seong Hyun

  Moon Baek [Teen]

  Guest Role
• 
  Lee Ja Ryoung

  [Landlord]

  Guest Role
• 
  Kang Shin Chul

  [Blue Brown organizer]

  Guest Role
• 
  Konstantin Romanenko

  [Gangster]

  Guest Role
• 
  Lee Joo Han

  [Citizen with a gun]

  Guest Role
• 
  Kim Han Gyeol

  [Nurse] (Ep. 3)

  Guest Role
• 
  Kang Myoung Soo

  [Police]

  Guest Role