Pied Piper

Director

• 
  Kim Hong Seon

Screenwriter

• 
  Ryu Yong Jae

Main Role

• 
  Shin Ha Kyun

  Joo Sung Chan

  Main Role
• 
  Jo Yoon Hee

  Yeo Myung Ha

  Main Role
• 
  Yoo Joon Sang

  Yoon Hee Sung

  Main Role

Support Role

• 
  Jeon Gook Hwan

  Seo Geon Il [K Group chairman]

  Support Role
• 
  Kim Jong Soo

  Yang Dong Woo [Seoul district police chief]

  Support Role
• 
  Park Sung Geun

  Kang Hong Suk [K Group Executive Dir., Gun' Il's bro-in-law]

  Support Role
• 
  Yoo Seung Mok

  Kong Ji Man [Crisis Negotiation team leader]

  Support Role
• 
  Jo Jae Yun

  Han Ji Hun [SWAT team leader]

  Support Role
• 
  Jang Sung Bum

  Jo Jae Hee [Sgt., profiler]

  Support Role
• 
  Oh Eui Shik

  Choi Seong Beom [Sergeant / Digital forensics expert]

  Support Role
• 
  Jung Hae Na

  Yoon Bo Ram [TNN Channel social affairs reporter]

  Support Role
• 
  Choi Won Hong

  Seo Joon [Seo Gun Il's son]

  Support Role
• 
  Kim Hong Pa

  Jung Tae Soo [Assembly member]

  Support Role
• 
  Kwak Dong Yeon

  Gong Jung In [Ji Man's son]

  Support Role
• 
  Lee Shin Sung

  Jung Soo Kyung

  Support Role
• 
  Lee Hae Young

  Chief Go

  Support Role
• 
  Park Choong Seon

  No Gyeong Seok [Former TNN syndicate president]

  Support Role
• 
  Woo Jung Kook

  Kim Jae Gon

  Support Role
• 
  Jung Dong Gyu

  Lee Joon Kyung [Director]

  Support Role
• 
  Shin Chul Jin

  Shin Won Chang

  Support Role
• 
  Go Yoon

  Jung Hyun Ho [Kidnapped victim's brother]

  Support Role
• 
  Lee Jung Eun

  Oh Ha Na [Seoul 112 General Situation room team leader]

  Support Role
• 
  Lee Won Jong

  Lee Cheol Yong [Detective]

  Support Role

Guest Role

• 
  Sung Dong Il

  Oh Jung Hak [Former Crisis Negotiation team leader]

  Guest Role
• 
  Kim Min Seo

  Lee Joo Eun [Sung Chan's girlfriend]

  Guest Role
• 
  Kim Ji Eun

  [PC cafe part-timer]

  Guest Role
• 
  Ham Sung Min

  [PC cafe customer]

  Guest Role
• 
  Park Ji Hwan

  Heo Tae Ung [Bank robber]

  Guest Role
• 
  Park Jung Min Guest Role
• 
  Geum Kwang San

  [Service Company's man]

  Guest Role
• 
  Lee Gyu Sub

  [Thug] (Ep. 13)

  Guest Role
• 
  Uhm Chae Young

  [Crying girl]

  Guest Role
• 
  Park Yong Guest Role
• 
  Park Geon Gyu

  [man being Interviewed]

  Guest Role
• 
  Yang Fan Guest Role
• 
  Lee Joo Young Guest Role
• 
  Cha Geon Woo

  [Migrant protesting to protect his homeland]

  Guest Role
• 
  Kang Deok Jung

  [man in training]

  Guest Role
• 
  Jeon Min Seo

  Yeo Myeong Ha [Young]

  Guest Role
• 
  Kim Ik Tae

  [Judge]

  Guest Role
• 
  Lee Moo Saeng

  [Prosecutor] (Ep.6)

  Guest Role
• 
  Kim Goo Hyun

  [Investigation Chief]

  Guest Role
• 
  Cha Soon Hyung

  [Cheng Zhi's coworker]

  Guest Role
• 
  Lee Kan Hee

  Moon Ji Hye [Doctor / Jung Hak's friend]

  Guest Role
• 
  Gong Ye Ji

  Yeon Joon Hee

  Guest Role
• 
  Kim Ki Moo

  Koo Dong Man

  Guest Role
• 
  Kim Byung Chun

  [Park manager]

  Guest Role
• 
  Na Gwang Hoon

  [Cheng Zhi's coworker]

  Guest Role
• 
  Kim Jung Seok

  [Cheng Zhi's coworker]

  Guest Role
• 
  Jang Kyug Su

  [Detective]

  Guest Role
• 
  Yoo Joon Hong

  [Plane hacker]

  Guest Role
• 
  Moon Hak Jin

  [Ambulance driver]

  Guest Role
• 
  Park Tae San Guest Role
• 
  Kim Seo Yeon Guest Role

Unknown

• 
  Kim Min Sang Unknown
• 
  Moon Seul A Unknown
• 
  Kim Dae Kyung Unknown