The Good Detective

Composer

• 
  Park Se Jun

Director

• 
  Jo Nam Gook

Screenwriter

• 
  Choi Jin Won

Main Role

• 
  Son Hyun Joo

  Kang Do Chang

  Main Role
• 
  Jang Seung Jo

  O Ji Hyeok

  Main Role
• 
  Lee Elijah

  Jin Seo Kyung

  Main Role
• 
  Oh Jung Se

  Oh Jong Tae

  Main Role
• 
  Ji Seung Hyun

  Yoo Jung Seok

  Main Role

Support Role

• 
  Son Jong Hak

  Moon Sang Beom

  Support Role
• 
  Jo Hee Bong

  Woo Bong Shik [Detective]

  Support Role
• 
  Shin Dong Mi

  Yoon Sang Mi [Investigator]

  Support Role
• 
  Yang Hyun Min

  Nam Gook Hyun [Detective]

  Support Role
• 
  Cha Rae Hyoung

  Kwon Jae Hong [Detective]

  Support Role
• 
  Kim Ji Hoon

  Byun Ji Woong [Detective]

  Support Role
• 
  Jung Soon Won

  Ji Man Goo [Detective]

  Support Role
• 
  Kim Myung Joon

  Shim Dong Wook [Detective]

  Support Role
• 
  Baek Eun Hye

  Kang Eun Hee [Do Chang's sister]

  Support Role
• 
  Son Byung Ho

  Kim Gi Tae

  Support Role
• 
  Jo Jae Ryong

  Jo Sung Dae

  Support Role
• 
  Jo Seung Yun

  Yoo Jung Ryul [Jung Seok's elder brother]

  Support Role
• 
  Jo Jae Yoon

  Lee Dae Cheol

  Support Role
• 
  Yoon Dae Yeol

  Choi U Jin

  Support Role
• 
  Lee Sang Woon

  Song Gwang Hee

  Support Role
• 
  Park Jung Min

  Go Gyung Ho

  Support Role
• 
  Kim Ryeo Eun

  Yoon Ji Sun

  Support Role
• 
  Lee Ha Eun

  Lee Eun Hye

  Support Role
• 
  Shin Jae Hoon

  ['Junghan Daily News' reporter]

  Support Role

Guest Role

• 
  Kim Si Eun

  Lee Eun Hye [Young] (Ep. 1)

  Guest Role
• 
  Ahn Shi Ha

  Jung Yoo Seon [Jin Soo's wife] (Ep. 1, 3, 7-8, 10)

  Guest Role
• 
  Cheon Young Min

  Jang Yoo Na (Ep. 1-2, 6-7)

  Guest Role
• 
  Lee Hyun Wook

  Park Geon Ho [Missionary] (Ep. 1-4)

  Guest Role
• 
  Yoon Bok Sung

  [Judge] (Ep. 1)

  Guest Role
• 
  Kim Seung Tae

  [Minister of Justice] (Ep. 1, 9, 11)

  Guest Role
• 
  Shin Jung Yoon

  Reporter Seo (Ep. 2)

  Guest Role
• 
  Shin Jae Hwi

  Park Hong Doo (Ep. 2, 6-7)

  Guest Role
• 
  Shin Hee Gook

  [Cashier] (Ep. 2)

  Guest Role
• 
  Lee Seung Jun

  Lee Han Joo [Prison guard] (Ep. 3, 5, 7)

  Guest Role
• 
  Heo Woong

  Shin Geun Ho (Ep. 3, 10)

  Guest Role
• 
  Baek Jong Hwan

  [Distribution center employee] (Ep. 3)

  Guest Role
• 
  Yang Hee Won

  Jae Woong [Eun Hee's son] (Ep. 4, 9, 11, 14. 16)

  Guest Role
• 
  Son Seung Hun

  [Video forensics] (Ep. 4-5)

  Guest Role
• 
  Lee Yu Jin

  [Sung Dae's secretary] (Ep. 4)

  Guest Role
• 
  Park Ji Hwan

  [Eun Hee's ex-husband] (Ep. 4, 14, 16)

  Guest Role
• 
  Kim Seung Han

  Oh Ji Hyuk [Young] (Ep. 5)

  Guest Role
• 
  Jung Hwan

  Go Joon Sup (Ep. 5, 8)

  Guest Role
• 
  Lee Seung Hun

  So Jae Sub [Attorney] (Ep. 5-7)

  Guest Role
• 
  Kim Seon Gyeong

  [Ji Hyuk's mother] (Ep. 5)

  Guest Role
• 
  Woo Kang Min

  Joo Dong Pal (Ep. 6)

  Guest Role
• 
  Jung Ji Ho

  Jung Ki Moon [Reporter] (Ep. 6, 10)

  Guest Role
• 
  Baek In Kwon

  [Prisoner] (Ep. 6-7)

  Guest Role
• 
  Song Yo Sep

  Park Dong Chul (Ep. 7)

  Guest Role
• 
  Hwang Tae Kwang

  Jang Jin Soo (Ep. 7, 10, 13, 15-16)

  Guest Role
• 
  Lee Do Guk

  Jung San Il [Prosecutor] (Ep. 7-8, 16)

  Guest Role
• 
  Kim Byung Soon

  [Judge] (Ep. 7)

  Guest Role
• 
  Kang Hak Soo

  [Judiciary committee] (Ep. 7)

  Guest Role
• 
  Yong Jin

  [Police officer] (Ep. 9)

  Guest Role
• 
  Kim Tae Hoon

  Park Joon Young (Ep. 12)

  Guest Role
• 
  O Gyu Taek

  [Gawol church pastor] (Ep. 13)

  Guest Role
• 
  Park Kyung Geun

  Jin Sung Hwan (Ep. 14)

  Guest Role
• 
  Lee Gyu Ho

  [Gang boss] (Ep. 14]

  Guest Role
• 
  Kim Sung Yong

  [Attorney] (Ep.16)

  Guest Role
• 
  Kwon Oh Jin

  Park Jun Sung (Ep. 15-16)

  Guest Role
• 
  Richard Kim

  [Auction VIP]

  Guest Role
• 
  Han Myung Chul

  [Victim's family) (Ep. 1)

  Guest Role
• 
  Woo Young Nam

  [Police officer] (Ep. 12)

  Guest Role
• 
  Nam Hee Soo

  Lee Se Jin [Dispatcher] (Ep. 1)

  Guest Role
• 
  Ko Dong Hyoung

  [Violent Crimes Team 1]

  Guest Role
• 
  Dok Ko Kwang

  [Hong Doo's group] (Ep. 6)

  Guest Role
• 
  Kang Ji Hoon

  [TV reporter] (Ep. 2)

  Guest Role
• 
  Yang Ji Woo

  [Playground kid]

  Guest Role
• 
  Park Byung Wook

  [Apt. security guard] (Ep. 8)

  Guest Role
• 
  Jo Joon

  Jo Byung Gil (Ep. 1,3)

  Guest Role
• 
  Lee Young Shil

  [Gook Hyun's relative] (Ep. 12)

  Guest Role
• 
  Seo Sang Won

  [Paramedic]

  Guest Role
• 
  Jang Woo Yeon

  Yoon Ji Sun's Roommate (Ep. 4, 7)

  Guest Role
• 
  Yoo Byung Sun

  [Wrecking yard employee] (Ep.12)

  Guest Role
• 
  Jung Tak

  Yoo Jung Seok [Young] (Ep. 11)

  Guest Role
• 
  Kwon Ji Hwan

  [Police officer] (Ep. 3)

  Guest Role
• 
  Ma Jung Pil

  Nam Sung Han [Secretary] (Ep. 2, 14)

  Guest Role
• 
  Kim Sung Joon

  [Auction bidder] (Ep. 1)

  Guest Role

Unknown

• 
  Lee Sang Hoon Unknown
• 
  Park Jin Soo Unknown
• 
  Park Tae Jin Unknown