Duelist (Korean: 형사, Hyeongsa) is a 2005 South Korean martial arts film, directed by Lee Myung-se. The Korean title translates as "The Detective".
The movie opens with a fish tale narrated by a low-class metalsmith in a tavern in Joseon-era south-western Korea. The scene then cuts to a street circus, in which an elegant masked swordmaster (Kang Dong-won) fascinates his market-place audience. Undercover detective Ahn (Ahn Sung-ki), and his protégé Namsoon (Ha Ji-won) are tracking down suspected money-counterfeiter gang, when the masked swordmaster ends his show by killing a government official who carries the kingdom's currency metal cast.
The swordmaster escapes when a cart crashes and disgorges a mountain of counterfeit coins, causing public commotion. The distraction is a success, but Namsoon chased and dueled with the escaping swordmaster/duelist, proving herself a master of martial arts specializing in a pair of long knives. She succeeded in cutting a quarter of his mask and glanced at his revealed eye before he escaped. She and her team are left with bodies of the counterfeit gang, seemingly massacred in an instant by an unknown duelist.
It is then revealed that counterfeit
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