Kim Hee Sook

Self - Forensic Officer, Seoul Metropolitan Police Agency

Park Myung Sun

Self - Team Leader, The Mobile Investigation Unit (Ret.)

Kwon Il-Yong

Self - Criminal Profiler

Yoo Young-Chul

Self - Serial Killer

Kang In Cheol

Self - Chief, Seodaemun Police Station (Ret.)

Park Ki Ryun

Self - Chief, Gangnam Police Station (Ret.)

Kang Dae-won

Self - Chief, The Mobile Investigation Unit (Ret.)

Yang Pil-joo

Self - Detective, The Mobile Investigation Unit

Brothel Operator

Self - Brothel Operator

Bae Sang Hoon

Self - Criminal Profiler (Ret.)

Lee Woong-Hyuk

Self - Professor of Criminal Psychology, Konkuk University

Lee Soo-Jung

Self - Professor of Criminal Psychology, Kyonggi University

Lee Geon-Seok

Self - Prosecutor (Ret.)

Kim Sang-Joong

Self - Detective, The Mobile Investigation Unit (Ret.)

Cho Wook Hee

Self - Journalist and Ko Jung-won's Godson

Kim Ji Yoon

Self - Political Scientist

Lee Soon-Hyuk

Self - Reporter

Go Na Mu

Self - Author