Detective Hansaem suspects Ena after she fails to remember anything about her uncle's murder.
A puzzle piece arrives on the same day as a murder, and Hansaem suspects it’s no coincidence.
Ena and Hansaem warily work together to solve the case.
A prime suspect emerges, but things aren't what they seem.
Another puzzle piece arrives, and a new murder case unfolds.
The meaning behind the drawings on the puzzle pieces is uncovered.
Hansaem makes a shocking discovery and becomes unsure of whom to trust.
As the investigation escalates, new suspects begin to emerge.
An unexpected suspect is arrested, shocking everyone involved.
A stunning truth behind the serial murders is revealed.
The final puzzle piece arrives will the team be able to catch the killer in time?
Kim Da-mi
Yoon Ena
Son Seok-koo
Kim Hansaem
Kim Sung-kyun
Yang Jeong-ho
Hyun Bong-sik
Choi San
Kwak Ja-hyung
Roh Su-kwang
Jang Kyug-su
Hyeon Ho-geun / Hangang Police Station Chief
Jeong Man-sik
Tae Dong-su / Captain
Ahn So-yo
Yun Go-eun
Hong Bi-ra
Byeon Ji-yun
Kim Doh-yon
Nam Hyeok-su
Lee Joo-young
Nam Na-ri
Park Gyu-young
Lee Seung-ju
Ji Su-yeon
Cho Gi-beum
Park Seong-yeon
Kong Yeong-im
Roh Jae-won
Hwang In-chan
Hwang Jung-min
Oh Cheol-jin
Ji Jin-hee
Yoon Dong-hoon
Park Sung-woong
Kwon Sang-beom
Kim Ye-won
Lee Mi-young
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