Người Cảnh Giác

Kim Chul Yoon

Koo Sung Ryeol

Kim Bum Suk

Choi Jun Sik

Woo Jung Kook

Jeong Deok Heung

Kwon Hae Hyo

Lee Joon Yeob [Professor]

Kim Hak Seon

Captain Eun

Lee Seo Hwan

Kwak Chang Hyeon

Lee Seung Woo

Min Seon Wook

Lee Hae Young

Uhm Jae Hyeob

Yang Hee Myung

Detective Jo

Jo Jae Young

Detective Ko

Park Kyung Chan

Heo Jae Min

Jo Han Joon

Hwang Jun

Won Hyun Joon

Nam Yeon Gil [Police officer]

Yeon Je Wook

Seo Doo Yeop

Nam Ji Woo

PD Kwon

An Tae Gyeong

[Narcotics detective]