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.
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