Undercover

Director

• 
  Song Hyun Wook
• 
  Park So Yeon

Screenwriter

• 
  Jung Hye Eun
• 
  Song Ja Hun
• 
  Baek Chul Hyun

Main Role

• 
  Ji Jin Hee

  Han Jeong Hyeon [Present]

  Main Role
• 
  Kim Hyun Joo

  Choi Yeon Soo [Present]

  Main Role
• 
  Yeon Woo Jin

  Han Jung Hyeon / Lee Seok Gyu [Young]

  Main Role
• 
  Han Sun Hwa

  Choi Yeon Soo [Young]

  Main Role

Support Role

• 
  Yoo Sun Ho

  Han Seung Goo [Jung Hyun & Yeon Soo's son]

  Support Role
• 
  Lee Jae In

  Han Seung Mi [Jung Hyun & Yeon Soo's daughter]

  Support Role
• 
  Jeong Man Sik

  Do Yeong Geol

  Support Role
• 
  Huh Joon Ho

  Im Hyeong Rak

  Support Role
• 
  Lee Han Wi

  Bae Gu Taek

  Support Role
• 
  Han Go Eun

  Ko Yun Ju

  Support Role
• 
  Kwon Hae Hyo

  Oh Pil Jae

  Support Role
• 
  Kang Young Seok

  Jung Cheol Hoon [Detective]

  Support Role
• 
  Bae Yoon Kyung

  Song Mi Seon

  Support Role
• 
  Choi Dae Chul

  Chu Dong Woo

  Support Role
• 
  Lee Seung Joon

  Kang Chung Mo

  Support Role
• 
  Son Jong Hak

  Yoo Sang Dong

  Support Role
• 
  Kim Soo Jin

  Min Sang Ah

  Support Role
• 
  Choi Kwang Il

  Hwang Jeong ho

  Support Role
• 
  Joo Seok Tae

  Park Won Jong

  Support Role
• 
  Park Jin U

  Detective Gu

  Support Role
• 
  Song Young Kyu

  Kwak Moon Heum [Chief Prosecutor]

  Support Role
• 
  Kim Dong Ho

  Woo Jin [Im Hyeong Rak's subordinate]

  Support Role
• 
  Cha Soon Bae

  Song Moon Bae

  Support Role
• 
  Park Doo Shik

  Do Yeong Geol [Young]

  Support Role
• 
  Seo Joon

  Hyun Pil

  Support Role
• 
  Ahn Se Ho

  Kim Kwang Cheol

  Support Role

Guest Role

• 
  Park Geun Hyung

  Lee Man Ho (Ep. 1-2)

  Guest Role
• 
  Im Ji Kyu

  Hwang Jeong Ho [Young] (Ep. 1)

  Guest Role
• 
  Nam Sung Jin

  Cha Min Ho (Ep. 1-2)

  Guest Role
• 
  Hong Jin Ki

  Kang Chung Mo [Young] (Ep. 1-2, 8)

  Guest Role
• 
  Moon Joo Won

  Han Seung Goo [Young] (Ep. 2)

  Guest Role
• 
  Kim Young Dae

  Kim Tae Yeol (Ep. 2-3, 8)

  Guest Role
• 
  Kim Young Woong

  [Subway control room staff] (Ep. 3)

  Guest Role
• 
  Kim Gyeong Min

  Mr. Park (Ep. 3-4)

  Guest Role
• 
  Shim Hyung Tak

  Lee Min Yool (Ep. 3-4)

  Guest Role
• 
  Kim Hye Jin

  Jung Hee [Min Ho's wife] (Ep. 3-4)

  Guest Role
• 
  Jung In Ki

  Kim Myung Jae [Secretary general] (Ep. 3-4)

  Guest Role
• 
  Lee Se Na

  Kim Da Kyung (Ep.4)

  Guest Role
• 
  Park Kyung Ri

  Go Yoon Joo [Young] (Ep. 4)

  Guest Role
• 
  Yoon Tae Soo

  [Student protestor]

  Guest Role
• 
  Hong Ye Ji

  [Reporter] (Ep. 3-4)

  Guest Role
• 
  Park Joo Hyung

  [Drug gang boss] (Ep. 4, 11)

  Guest Role
• 
  Jung Dong Gyu

  Lee Kang Ho (Ep. 5-6)

  Guest Role
• 
  Park Jung Eon

  Lee Young Sook (Ep. 5-6)

  Guest Role
• 
  Seo Young Sam

  Park Young Soo (Ep. 5-6)

  Guest Role
• 
  Lee Yoon Sang

  Park Joo Won (Ep. 5-6)

  Guest Role
• 
  Kim Jung Jin

  Kim Ah Soon (Ep. 5-6)

  Guest Role
• 
  Choi Gyo Shik

  Priest Ha (Ep. 5-6)

  Guest Role
• 
  Kim Deok Ju

  [Kim Ah Soon's mother] (Ep. 6)

  Guest Role
• 
  Shin Bi

  Jang Yu Bin (Ep. 6, 8-9)

  Guest Role
• 
  Kim Jin Goo

  Kim Dong Young (Ep. 6)

  Guest Role
• 
  Kim Nam Jin

  [Kim Myung Jae's wife] (Ep. 7-8)

  Guest Role
• 
  Jeon Hye Won

  [Kim Myung Jae's daughter] (Ep. 7-8)

  Guest Role
• 
  Jun Joon Woo

  [Police officer] (Ep. 6)

  Guest Role
• 
  Han Yi Jin

  Park Doo Shik [Young] (Ep. 8,11)

  Guest Role
• 
  Sung Byung Sook

  [Kim Tae Yeol's mother] (Ep. 8)

  Guest Role
• 
  Oh Ki Hwan

  Prosecutor Kon Soon Chun (Ep. 8-9)

  Guest Role
• 
  Gi Hwan

  Prosecutor Ryu Sung Hyun (Ep. 8-9)

  Guest Role
• 
  Kim Sung Yong

  Jeon Hong Go (Ep. 9)

  Guest Role
• 
  Han Bo Bae

  Min Sang Ah [Young] (Ep.10, 16)

  Guest Role
• 
  Kwon Tae Won

  [Police officer] (Ep. 9-10)

  Guest Role
• 
  Nam Jung Woo

  Sergeant Won Bok Dong (Ep. 9)

  Guest Role
• 
  Yeon Je Wook

  [Loan shark] (Ep. 7)

  Guest Role
• 
  Lee Moo Nyoung

  [CIO protester] (Ep. 8)

  Guest Role
• 
  Han Jae Young

  [Yeoyeong Inn owner] (Ep. 8-9)

  Guest Role
• 
  Yoo Mi Sun

  [Saleswoman] (Ep. 10)

  Guest Role
• 
  Kim Joo Ah

  [Orphanage employee] (Ep. 11)

  Guest Role
• 
  Park Sang Yong

  [Park Won Jong's attorney] (Ep. 12)

  Guest Role
• 
  Jin Shi Won

  [Reporter] (Ep. 8)

  Guest Role
• 
  Min Choong Suk

  [Police officer] (Ep. 15)

  Guest Role
• 
  Yook Mi Ra

  [Assemblywoman] (Ep. 15)

  Guest Role
• 
  Park Jae Wan

  Assemblyman Cho (Ep. 15)

  Guest Role
• 
  Lee Jae Woo

  [Assemblyman] (Ep. 15)

  Guest Role
• 
  Kim Dong Gon

  [News program panelist] (Ep. 8)

  Guest Role
• 
  Kim Do Vin

  (Ep. 4, 13)

  Guest Role
• 
  Im Jung Ok

  Nurse KIm

  Guest Role
• 
  Choi Hong Lag

  (Ep.1)

  Guest Role
• 
  Lee Eun Ju

  Hwang Hyeon Ju (Ep. 6)

  Guest Role
• 
  Kim In Suk

  [Real estate agent] (Ep. 7)

  Guest Role
• 
  Park Jong Wook Guest Role
• 
  Han Seung Yup

  Han Sang Jin (Ep. 6)

  Guest Role
• 
  Park Woo Jae

  [CIO security guard] (Ep. 7)

  Guest Role
• 
  Kim Do Won

  [Im Hyung Rak's grandson] (Ep. 7)

  Guest Role
• 
  Kim Byung Soon

  Yang Ho Won [Assemblyman] (Ep. 2)

  Guest Role
• 
  Jang Eui Don

  [Police university instructor] (Ep. 1)

  Guest Role
• 
  Lee Hwi Won

  [Senior gangster]

  Guest Role
• 
  Lee So Ra

  [Nurse] (Ep. 10)

  Guest Role
• 
  Ma Jung Pil

  Attorney Park (Ep. 16)

  Guest Role
• 
  Kong Joon Min

  Attorney Park (Ep. 2, 15)

  Guest Role
• 
  Richard Kim

  Park Joo Won [NIS hearing attendee] (Ep. 2)

  Guest Role
• 
  Jeong Seung Wook

  [Reporter] (Ep. 15)

  Guest Role
• 
  Kwon Ji Hwan

  [Agent] (Ep. 16)

  Guest Role
• 
  Lee Jin Seung

  Park Jun Suk (Ep. 8-9)

  Guest Role
• 
  Kim Jong Ho

  [Attorney] (Ep. 5)

  Guest Role
• 
  Kim Jin Kyu

  [Daehan Jeil Daily staff]

  Guest Role
• 
  Jeon Se Yong

  [Public hearing host]

  Guest Role
• 
  Nam Hee Soo

  [ID office clerk] (Ep. 4)

  Guest Role
• 
  Min Tae Hong

  [Freshman protester]

  Guest Role
• 
  Jang Myoung Un

  [Hyung Rak's security team] (Ep. 14)

  Guest Role
• 
  Do Mi Yeon

  Ko Yu Ri (Ep. 6)

  Guest Role
• 
  Yoo Byung Sun

  [Scrapyard crane operator] (Ep.2)

  Guest Role
• 
  Lee Ha Eum

  [Hankuk University student protestor]

  Guest Role
• 
  Son Jeong Won

  [CIO staff]

  Guest Role

Bit part

• 
  Kim Kye Hyung

  [Car passenger] (Ep.1)

  Bit part
• 
  Lee Dong Soo

  [Interviewer]

  Bit part

Unknown

• 
  Park Tae Jin Unknown
• 
  Kim Dong Ho

  Cheon Woo-jin

  Unknown
• 
  Kim Young Hee Unknown