On her birthday, Yoon Jiwoo witnesses the horrific death of her father. Hell-bent on taking revenge at any cost, she sets out to find his killer.

Choi Mujin imposes punishment on Do Gangjae. Instructed to join the police force undercover, Jiwoo takes on a brand-new identity.

When her team goes after an unforeseen target in a sudden raid, Jiwoo must act fast. A new drug ring and its malevolent leader threaten Mujin's empire.

Cha Giho sees Gangjae's declaration of war on Mujin as an opportunity. Suspecting Jiwoo is up to something, Jeon Pildo tails her.

Jiwoo and Pildo's narrow escape from peril shifts the police's focus onto Gangjae. A run-in with a familiar face at the precinct places Jiwoo on edge.

A photo in the mail revealing obscured truths casts everything Jiwoo thought she believed into doubt. Mujin moves to protect his interests.

Jiwoo fights off an ambush. Mujin submits himself to a police interrogation. Pildo gets his hands on incriminating phone call records.

Intent on changing Jiwoo's mind about carrying out her vengeance, Pildo handcuffs himself to her. Mujin reacts to another act of betrayal.