Nine Puzzles

As a high school student, Yoon E-na discovered her murdered uncle's body, with a peculiar puzzle piece found at the scene. As the only eyewitness, she found herself unable to recall how she ended up there, making her the primary suspect in the eyes of Detective Kim Han-saem. A decade later, E-na has become an exceptional criminal profiler, working for the Seoul Metropolitan Police Agency's criminal analysis team. However, she is still tormented by the unresolved murder of her uncle. A new wave of serial killings surfaces, each one accompanied by identical enigmatic puzzle pieces, echoing the incident that transformed her life. This prompts E-na to collaborate with Han-saem once more, who, despite their tense partnership, still carries doubts regarding her role in her uncle's murder case.