On her birthday, Yoon Ji-woo witnesses her father’s brutal murder. Determined to take revenge, she seeks out the crime boss Dong-hoon for help.

Ji-woo begins extreme training under Dong-hoon’s men to become strong enough to hunt down her father’s killer.

Ji-woo goes undercover in the police force while secretly working for the drug gang, putting her life in constant danger.

As Ji-woo earns trust in the narcotics unit, she becomes closer to detective Pil-do, but her hidden mission complicates everything.

A dangerous bust spirals into violence. Ji-woo’s loyalty is questioned as police and gang members close in on her double identity.

Ji-woo uncovers shocking clues about her father’s past and realizes the truth behind his death may be far more complicated.

Betrayal strikes from unexpected places. Ji-woo is forced into a deadly confrontation as her world begins collapsing.

Ji-woo finally faces the truth and takes her revenge, but the cost is devastating as she fights to survive the final bloodbath.