

Believe but be doubtful.
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.

Kim Hyeong-min

Kang Tae-oh

Kim Soo-min

Detective Jo
Chief of Crime Department

Ji-hee's Grandmother

Lawyer

Jeong-bong

Detective Han

Hair Salon Manager

Kang Sook-ja

Hyeong-min's Father