During the Joseon Dynasty in the 16th century, a counterfeit currency case that spread across the country caused a headache for the court. Female detective Nam Soon (played by Ha Ji-won) and her experienced and witty partner Detective Ahn (played by Ahn Sung-ki) worked hard to investigate the case. The two found clues to the counterfeit currency at the market, but unexpectedly the suspects were all killed by a masked man. The swordsman kills...