Less Than Evil

Composer

• 
  Jeon Jong Hyeok

Director

• 
  Kim Dae Jin
• 
  Lee Dong Hyeon

Screenwriter

• 
  Heo Joon Woo
• 
  Kang Yi Hun

Main Role

• 
  Shin Ha Kyun

  Woo Tae Seok

  Main Role
• 
  Lee Seol

  Eun Sun Jae

  Main Role
• 
  Park Ho San

  Jeon Choon Man

  Main Role
• 
  Kim Gun Woo

  Jang Hyung Min / Jang Seon Ho

  Main Role

Support Role

• 
  Cha Sun Woo

  Chae Dong Yoon [Tae Seok's partner]

  Support Role
• 
  Hong Eun Hee

  Kim Hae Joon [Tae Seok's wife]

  Support Role
• 
  Ryu Tae Ho

  Choi Jung Woo [Police Chief]

  Support Role
• 
  Bae Da Bin

  Shin Ka Young [Detective]

  Support Role
• 
  Yoon Hee Seok

  Jo Doo Jin [Public Relations Officer]

  Support Role
• 
  Bae Yoo Ram

  Ban Ji Deuk [Hacker]

  Support Role
• 
  Yang Jae Young

  Lee Moon Ki [Detective]

  Support Role
• 
  Bae Yoon Kyung

  Woo Tae Hee [Tae Seok's sister]

  Support Role
• 
  Ha Eun Seom

  Team Leader Sung

  Support Role
• 
  Kim Ho Jung

  [Forensic police officer]

  Support Role
• 
  Shim Eun Woo

  Jeon Joo Yeon

  Support Role
• 
  Cho Yi Hyun

  Bae Yeo Wool [Tae Hee's friend]

  Support Role
• 
  Kim Yi Kyeong

  Kwon Soo Ah

  Support Role
• 
  Min Joon Hyun

  [Section chief]

  Support Role
• 
  Ha Min

  Goo Young Mi

  Support Role
• 
  Uhm Tae Yoon

  Seo Ji Hun [Kidnapping case witness]

  Support Role

Guest Role

• 
  Lee A Ra

  Hwang Eun Joo (Ep.1)

  Guest Role
• 
  Jung Sung Yoon

  [Office worker in prosecution]

  Guest Role
• 
  Joel Roberts

  [US Soldier]

  Guest Role
• 
  Jeon Jin Ki

  Song Man Soo [Convict]

  Guest Role
• 
  Kim Dong Won

  Song Yoo Jin [Man Soo's son]

  Guest Role
• 
  Lee Yong Joo

  Go Joo Seong [Murderer]

  Guest Role
• 
  Kwon Tae Won

  [Director General of Police]

  Guest Role
• 
  Ahn Nae Sang

  [Commissioner general]

  Guest Role
• 
  Jung Myung Joon

  Han Nam Ki [Attorney]

  Guest Role
• 
  Lee Jae Yoon

  Kang Woo Joon [The Punisher]

  Guest Role
• 
  Kim Gi Cheon

  Chief Seo Jae Geun

  Guest Role
• 
  Song Min Hyung

  Lee Soo Han [Hankyul Hospital Director]

  Guest Role
• 
  Kim Jong Goo

  Choi Yang Soo [Assemblyman]

  Guest Role
• 
  Hwang Seok Jeong

  Hwang Bu Kyung [Victim's mother]

  Guest Role
• 
  Kim Bo Kyung

  [Detective]

  Guest Role
• 
  Hong Seo Joon

  Yoo Jung Soo

  Guest Role
• 
  Choi Jong Won

  Lee Sung Hak [Serial Killer]

  Guest Role
• 
  Lee Shi Woo

  Song Yoo Jin |Young]

  Guest Role
• 
  Bae Hyun Kyung

  Jang Seok Gu (Ep. 21-24)

  Guest Role
• 
  Ahn Soo Bin

  [Injured policewoman]

  Guest Role
• 
  Han Seung Hyun

  [Ward Office Staff]

  Guest Role
• 
  Kim I San

  [Announcer]

  Guest Role
• 
  Kang Pil Sun

  [Doctor]

  Guest Role
• 
  Lee Sun Young

  [CSI staff]

  Guest Role
• 
  Jeong Seo Yeon

  Kim Sung Mi

  Guest Role
• 
  Jo Yong Jin

  Im Ji Ho [Young]

  Guest Role
• 
  Han Bom

  [Banker]

  Guest Role
• 
  Park Se Hoon

  [Coast guard]

  Guest Role
• 
  Kim Dae Kook

  [Bank security office staff]

  Guest Role
• 
  Kim Won Joong Guest Role
• 
  Sul Ji Yoon

  Kim Nan Hee

  Guest Role
• 
  Ahn Hye Won

  [Detective Jo's wife]

  Guest Role
• 
  Im Too Chul

  [Internet broadcast BJ]

  Guest Role
• 
  Park Seon Woo

  [Police officer]

  Guest Role
• 
  Lee Ji Wan

  [High school girl]

  Guest Role

Unknown

• 
  Choi Moon Kyung Unknown
• 
  Shin Soo Hyun Unknown
• 
  Bae Eun Woo Unknown
• 
  Kwon Oh Soo Unknown