A reclusive ex-cop reenters the game as an insurance investigator, searching for clues in crime scenes perfectly staged by a serial killer in her midst.
Episode 1In need of a big win at work, Na Je-hui plays on Koo Kyung-yi's strengths and weaknesses to enlist her help on a missing person's case.
Episode 2
E2
Episode 2Kyung-yi suspects there's more to this accident than meets the eye. Reuniting with an old classmate, Song Yi-kyung hears about a former teacher's fate.
Episode 3
E3
Episode 3A news story about a criminal's light sentence establishes the next target for "K," who sets the scene at a bustling university campus.
Episode 4
E4
Episode 4Santa's chase after "K" puts the team on high alert, especially Kyung-yi. A spooked co-conspirator distances himself from the criminal mastermind.
Episode 5
E5
Episode 5Jung Jeong-yeon thinks back to a traumatic incident in her niece's past. Following a hunch that "K" might leave the country, Kyung-yi's team sets a trap.
Episode 6
E6
Episode 6Kyung-yi sifts through Yi-kyung's playbooks to find out the next target. An outcast's account takes the team to an IT company headed by a public figure.
Episode 7
E7
Episode 7In a high-stakes game of cat and mouse, Kyung-yi tries to find and stop the deadly plans Yi-kyung has set in place for Ko Dam's public event.
Episode 8
E8
Episode 8Yi-kyung's loss plunges her into a world of reckless darkness. Both Yi-kyung and Kyung-yi seek answers on the inexplicable outcome of the event.
Episode 9
E9
Episode 9Yi-kyung joins hands with Yong-suk, replacing a down-in-the-dumps Kyung-yi who falls out of favor with the strong-handed director.
Episode 10
E10
Episode 10Kyung-yi inches closer to finding out the truth behind the boat party. Yi-kyung tries to escape the suffocating grasp of Yong-suk's control.
Episode 11
E11
Episode 11Yong-suk begs for Kyung-yi's help after a video of the yacht party is leaked. Yi-kyung taps a member of Kyung-yi's team for a covert collaboration.
Episode 12
E12
Episode 12Santa is held hostage by Yi-kyung, who reveals his identity to a disbelieving Kyung-yi. Yong-suk's plans blow up in her face.
Cast of Season 1
Lee Young-aeKoo Kyung-yi
Kim Hye-junSong Yi-kyung / "K"
Kim Hae-sookDirector Yong
Kwak Sun-youngNa Je-hui
Baek Sung-chulSanta
Cho Hyun-chulOh Gyeong-su
Lee Hong-naeAn Geon-uk
Season 1 Ratings & Reviews
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