Bo-na returns to work after a three-year leave. Tae-sung learns the vanished serial killer is back in action.

Tae-sung and the police are both shocked by Kingfisher's return, and a new recruit joins Bo-na's company.

Hyun Nam tells Bo Na why she joined Bo Na's team. Meanwhile, Sales Team 3 goes on a team workshop.

Bo Na worries about work and childcare. Meanwhile, child sex offender Pyo Gyu Cheol is released from prison.

Bo Na prepares the memorial rite with her mother-in-law. Tae Sung probes a construction worker's death.

Bo Na prepares for the Client Meeting, but the unexpected arrival of various individuals derails her plan.

Eight years ago, Bo Na and Tae Sung, while engaged in their separate work, met through a chance encounter.

Tae Sung meets Bo Na again at a remote lodge. Criminals fearing Kingfisher seek jail after being released.

Bo Na's Russian mercenary friend Sergei is back. Dong Jin learns his parents' killer Jang Eun Hak is paroled.

Paroled Jang Eun Hak attempts murder again. This incident prompts Tae Sung to resume writing on Kingfisher.

Dong Jin, assigned to the Kingfisher team, meets Tae Sung's past assailant, finding Kingfisher may be female.

The task force closes in with a new lead, and Tae Sung faces a growing dilemma.

Kingfisher stands accused of new civilian murders, while her former associate, Leila, targets her family.

Leila is killed by the police after the chase, and Bo Na realizes that her identity is revealed to Tae Sung.