Pied Piper

Jeon Gook Hwan

as Seo Geon Il [K Group chairman]

Pemeran Pembantu

Kim Jong Soo

as Yang Dong Woo [Seoul district police chief]

Pemeran Pembantu

Park Sung Geun

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

Pemeran Pembantu

Yoo Seung Mok

as Kong Ji Man [Crisis Negotiation team leader]

Pemeran Pembantu

Jo Jae Yun (조재윤)

as Han Ji Hun [SWAT team leader]

Pemeran Pembantu

Jang Sung Bum

as Jo Jae Hee [Sgt., profiler]

Pemeran Pembantu

Sung Dong Il

as Oh Jung Hak [Former Crisis Negotiation team leader]

Bintang Tamu

Kim Min Seo

as Lee Joo Eun [Sung Chan's girlfriend]

Bintang Tamu

Kim Ji Eun

as [PC cafe part-timer]

Bintang Tamu

Ham Sung Min

as [PC cafe customer]

Bintang Tamu

Park Ji Hwan

as Heo Tae Ung [Bank robber]

Bintang Tamu

Park Jung Min

Bintang Tamu