Santa is held hostage by Yi Kyung, who reveals his identity to a disbelieving Kyung Yi. Yong Suk's plans blow up in her face. 

Yong 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. 

Kyung 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.

Yi Kyung joins hands with Yong Suk, replacing a down-in-the-dumps Kyung Yi who falls out of favor with the strong-handed director.

Yi-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.

In 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.

Kyung-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.

Jung 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.

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

A news story about a criminal's light sentence establishes the next target for "K," who sets the scene at a bustling university campus.

Kyung-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.

In 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.