A girl name Yoon Ji Woo is the daught od a highliy ranked gang member of Dong Cheon. One day she witnessed her father Dong Hoon being brutally murdered at point blank range outside their apartment. With rumours that the police are involved, she desperately wants recvent on whoever is responsible for her father's dealth So she decided to join the drug crime group Dong Cheon.
Choi Mu Jin is the boss of the drug gang and he took Ji Woo under his wing and trains her to tougher her up to seek revenge. This leads her to work in the police force as a mole under the fake identity of Oh Hye Jin in order to find the identity of her father's killer. However, through her work in the police, sh found out that her dad was a cop until the day he die. Watch to find out who is the killer of her father.
