
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.
Han Saem makes a shocking discovery and becomes unsure of whom to trust.
As the investigation escalates, new suspects begin to emerge.
In an unexpected twist, a new suspect is arrested shortly before another victim is discovered. E-na and Han-saem risk it all to try and catch the true killer.
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?