Inspector Koo

Kyung-yi suspects theres more to this accident than meets the eye. Reuniting with an old classmate, Song Yi-kyung hears about a former teachers fate.

Santas chase after "K" puts the team on high alert, especially Kyung-yi. A spooked co-conspirator distances himself from the criminal mastermind.

Kyung-yi sifts through Yi-kyungs playbooks to find out the next target. An outcasts account takes the team to an IT company headed by a public figure.

Yi-kyungs loss plunges her into a world of reckless darkness. Both Yi-kyung and Kyung-yi seek answers on the inexplicable outcome of the event.

Kyung-yi inches closer to finding out the truth behind the boat party. Yi-kyung tries to escape the suffocating grasp of Yong-suks control.

Santa is held hostage by Yi-kyung, who reveals his identity to a disbelieving Kyung-yi. Yong-suks plans blow up in her face.