Connection

Composer

• 
  Kim Joon Seok
• 
  Jung Se Rin

Director

• 
  Kim Moon Kyo
• 
  Kwon Da Som

Producer

• 
  Lee Tae Gon

Screenwriter

• 
  Lee Hyeon

Main Role

• 
  Ji Sung

  Jang Jae Gyeong

  Main Role
• 
  Jeon Mi Do

  O Yun Jin

  Main Role
• 
  Kwon Yul

  Park Tae Jin

  Main Role
• 
  Kim Kyung Nam

  Won Jong Su

  Main Role

Support Role

• 
  Jung Soon Won

  Heo Ju Song [Two Star Holdings CEO]

  Support Role
• 
  Jung Yoo Min

  Choi Ji Yeon

  Support Role
• 
  Yoon Na Moo

  Park Jun Seo

  Support Role
• 
  Moon Sung Keun

  Won Chang Ho [Jong Su's father]

  Support Role
• 
  Cha Yeob

  O Chi Hyeon

  Support Role
• 
  Lee Kang Wook

  Jung Yun Ho [Taxi driver]

  Support Role
• 
  Jung Jae Kwang

  Kim Chang Su [Detective]

  Support Role
• 
  Seo Yi Ra

  O Su Hyeon [Detective]

  Support Role
• 
  Yoo Hee Je

  Gong Jin Uk

  Support Role
• 
  Han Hyun Jun

  Min Hyeon U [Student]

  Support Role
• 
  Lee Hyun So

  Park Jun Seo [Young]

  Support Role
• 
  Lee Sang Jun

  Kim U Sung

  Support Role
• 
  Park Keun Rok

  Jeong Sang Wi

  Support Role
• 
  Park Jung Pyo

  Yoo Gyeong Hwan

  Support Role
• 
  Yoon Sa Bong

  Jung Yeon Ju

  Support Role
• 
  Ryu Hye Rin

  Kang Si Jung

  Support Role
• 
  Cho Han Gyeol

  Jang Jae Gyeong [Young]

  Support Role
• 
  Kim Min Ju

  O Yun Jin [Young]

  Support Role
• 
  Cho Min Gu

  Heo Ju Song [Young]

  Support Role

Guest Role

• 
  Ryu Hae Jun

  An Myeong Ho (Ep. 1)

  Guest Role
• 
  Kim Joong Ki

  Jeon In Sang [Mayor] (Ep. 1)

  Guest Role
• 
  Lee Dong Gyu

  [Anchorman] (Ep. 1)

  Guest Role
• 
  Lee Chang Hoon

  [Corporate PR staff] (Ep. 1)

  Guest Role
• 
  Uhm Tae Ok

  [Apartment security guard] (Ep. 1)

  Guest Role
• 
  Lee Dong Soo

  [Internal affairs investigator] (Ep. 1)

  Guest Role
• 
  Kim Mi Ji

  [Nurse] (Ep. 1-2)

  Guest Role
• 
  Kim Do Young

  Jang Tae Jeong (Ep. 2)

  Guest Role
• 
  Yang Hee Woo

  [Police officer] (Ep. 2)

  Guest Role
• 
  Lee Joong Yul

  [Apartment security guard] (Ep. 2)

  Guest Role
• 
  Han Ki Jang

  [Subway CCTV staff] (Ep. 2, 6)

  Guest Role
• 
  Lee Eun

  Lee Eun Hui (Ep. 3)

  Guest Role
• 
  Oh Il Young

  Lee Myeong Guk (Ep. 3)

  Guest Role
• 
  Do Geon Wu

  Min Ho (Ep. 3-4)

  Guest Role
• 
  Lee Yeon Joo

  [Realty manager] (Ep. 3, 14)

  Guest Role
• 
  Kang Hak Soo

  [Site manager] (Ep. 4)

  Guest Role
• 
  Jung Gi Sub

  [Bok Rye’s son] (Ep. 4)

  Guest Role
• 
  Yoo Byung Hoon

  [Mill & rice cake store owner] (Ep. 4)

  Guest Role
• 
  Kwak Ji Sook

  Director Kim (Ep. 5)

  Guest Role
• 
  Lee Jae U

  Taxi Driver Park (Ep. 5)

  Guest Role
• 
  Park Geon Rak

  [Manager] (Ep. 5)

  Guest Role
• 
  Ko Dong Ha

  [Restroom boy] (Ep. 5)

  Guest Role
• 
  Jang Eun Seo

  [Anhyun Taxi staff] (Ep. 5)

  Guest Role
• 
  Ahn Soo Ho

  [Gyu Min's landlord] (Ep. 5)

  Guest Role
• 
  Jo Hyun Im

  [Parked car witness] (Ep. 5)

  Guest Role
• 
  Kim Hyo Jin

  [Hyeon U's grandma] (Ep. 5)

  Guest Role
• 
  Min Eung Shik

  Kang Yeong Hun (Ep. 6)

  Guest Role
• 
  Bae Seong Il

  Park Gwang Yeong (Ep. 6)

  Guest Role
• 
  Bae Jae Young

  Kim Dae Sung (Ep. 6, 7, 10, 11)

  Guest Role
• 
  Park Yong

  [Hearing aid seller] (Ep. 6, 10)

  Guest Role
• 
  Cho Yu Jin

  [Doctor] (Ep. 7)

  Guest Role
• 
  Park Byung Wook

  [Security guard] (Ep. 7)

  Guest Role
• 
  Park Hee Jung

  [Director’s secretary] (Ep. 7)

  Guest Role
• 
  Kim Su Kyung

  Yoo Seong Eun (Ep. 7-8)

  Guest Role
• 
  Yoo Soon Woong

  [Cold storage security guard] (Ep. 7-8)

  Guest Role
• 
  Park Jin

  Eom Si Jeong (Ep. 7, 10)

  Guest Role
• 
  Park Jae Wan

  [Wonjin Bank VP] (Ep. 8)

  Guest Role
• 
  Lee Jae In

  [Diet clinic doctor] (Ep. 8)

  Guest Role
• 
  Lee Shin Ki

  Han Seong Hun (Ep. 9)

  Guest Role
• 
  Shin Yeon Woo

  [Yun Ho's daughter] (Ep. 9)

  Guest Role
• 
  Jung Mi Kyung

  [Geun Ho's mom] (Ep. 10)

  Guest Role
• 
  Na Ho Won

  [Geun Ho's dad] (Ep. 10)

  Guest Role
• 
  Kim Young Mi

  [Doctor] (Ep. 11)

  Guest Role
• 
  Kim Kwang Suk

  [Police officer] (Ep. 11)

  Guest Role
• 
  Shin Jun Chul

  [Internet cafe worker] (Ep. 11)

  Guest Role
• 
  Lee Hyun

  [Dry cleaners worker] (Ep. 11)

  Guest Role
• 
  Kim Bi Bi

  Park Eun Yeong [Doctor] (Ep. 12)

  Guest Role
• 
  Kim Doo Eun

  [Hiker] (Ep. 12)

  Guest Role
• 
  Park Chan Woo

  No Gyu Min (Ep. 13)

  Guest Role
• 
  Jo Myung Haeng

  [Smuggler] (Ep. 13)

  Guest Role
• 
  Kim Young Sun

  [Kyung Tae’s mom] (Ep. 13)

  Guest Role
• 
  Baek Ji Won

  CEO Yun

  Guest Role
• 
  Kim Min Shik

  Park In Su

  Guest Role
• 
  Park Sang Won

  Lee Geun Ho

  Guest Role
• 
  Choi Young Woo

  Jang Cheol Gu

  Guest Role
• 
  Seo Sang Won

  Bae Byeong Ho

  Guest Role
• 
  Lee Su Chan

  Chae Gyeong Tae

  Guest Role
• 
  Jang Hyuk Jin

  Hwang Hong Suk

  Guest Role
• 
  Baek Jae Woo

  Park Tae Jin [Young]

  Guest Role
• 
  Ahn Do Kyu

  No Gyu Min [Young]

  Guest Role
• 
  Park Si Yun

  Won Jong Su [Young]

  Guest Role
• 
  Park Jin U

  [Teacher]

  Guest Role
• 
  Ahn Sung Bong

  [CEO Yun's subordinate]

  Guest Role
• 
  Seo Yeong Su

  Ko Gi Sung

  Guest Role
• 
  Jaspreet Kaur

  [Kidnapped worker] (Ep. 1)

  Guest Role
• 
  Bae Jun Hyung

  Jung Sang Eui [Teen]

  Guest Role