Inspector Koo is a gripping mystery series that follows the story of a reclusive ex-cop, Koo Kyung-yi (Lee Young-ae), who returns to the game as an insurance investigator. She is tasked with solving a series of murders that have been perfectly staged to look like accidents, all while dealing with her own personal demons. As she delves deeper into the case, she uncovers a web of deceit and conspiracy that threatens to destroy everything she holds dear. With a sharp mind and unrelenting determination, Inspector Koo must outsmart the cunning serial killer and bring them to justice before it's too late.

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Some TV shows that have similar genres and were produced around the same time as Inspector Koo include Dead Boy Detectives, Avatar: The Last Airbender, Limitless, Chuck, Kamen Rider Kuuga, Buffy the Vampire Slayer.