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.

The meaning behind the drawings on the puzzle pieces is uncovered.

Hansaem makes a shocking discovery and becomes unsure of whom to trust.

The final puzzle piece arrives will the team be able to catch the killer in time?
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