
Plot
A serial killer is caught for his seventh murder. A cop tries to solve the first six cases with the killer's help, but starts to suspect that he has ulterior motives. Based on a true story.
Trailer
Cast

Kim Yun-seok
Kim Hyeong-min

Ju Ji-hoon
Kang Tae-oh

Moon Jeong-hee
Kim Soo-min

Jin Sun-kyu
Detective Jo

Jung Jong-joon
Chief of Crime Department

Heo Jin
Ji-hee's Grandmother

Kim Joong-ki
Lawyer

Kim Young-woong
Jeong-bong

Jeong Gi-seop
Detective Han

Kim Mi-hwa
Hair Salon Manager

Lee Bong-ryeon
Kang Sook-ja

Jeon Kuk-hwan
Hyeong-min's Father

Kim Jong-soo
Captain Ma-soo

Bae Hae-seon
Park Mi-yeong

Won Hyun-jun
Kim Wook-cheol

Park Jin-young
Judge

Ju Jin-mo
Song Kyeong-soo

Ko Chang-seok
Diving Captain Jam-soo

Lee Yoo-jun
President Park

Kwon So-hyun
Oh Ji-hee

Jeong Taek-hyeon
Young Kang Tae-oh

Kim Mi-kyeong
Noodle Restaurant Owner

Park Sung-hyun
Detective