
Complete the puzzle.
Ten years after discovering her murdered uncle, Ena and Detective Hansaem must cooperate to stop a series of similar murders - each linked by strange puzzle pieces.

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?

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