Duelist

Stars: Ha Ji-won, Kang Dong-won and Ahn Sung-ki
The movie is based on a novel about a female detective in the Choson Kingdom.

Ha plays a tomboy detective named Nam-sun who investigates the forgery of coins but confronts inner conflicts as she falls in love with an assassin (Kang) involved in the crime while chasing him.

From: The Korea Times
http://times.hankooki.com/lpage/cultu...211720.htm