Thrilling action, political intrigue, and forbidden romance all light up the screen in this inventive detective story set back during the Chosun dynasty!

Tomboyish detective Nam Sun (Ha Ji-won) ends up being assigned to investigate a case revolving around some counterfeit coins. Going deep undercover in a variety of diverse disguises, Nam Sun quickly finds herself chasing after a notorious assassin named Sad Eyes (Kang Dong-won) who may just be involved in the crime she's investigating. These two warriors from opposite ends of the law end up clashing time and time again, but with each passing encounter, they soon discover that they share a mutual respect and attraction for one another. Will a love affair bloom on the battlefield?

While it's clearly that in this is a high stakes game of cat and mouse for both of them, it seems that the hunter has clearly fallen for the prey. But is Sad Eyes somehow connected to the Minister of Defense's plan to take over the country? If so, Nam Sun has only one choice: fulfill her duty. But can she?