The Ultimate Weapon (International English title)(최종병기 활)is a August, 2011 Movie directed by Kim Han-Min South Korea.
Set during the second Manchu invasion of Korea, Nam-Yi ( Park Hae-Il ), the best archer in Korea, goes up against the Qing Dynasty to save his younger sister Ja-In ( Moon Chae-Won ) - who was dragged to their kingdom and held as a hostage.
13 years after the King Injo Revolt, the Chosun Dynasty is attacked by the Chung Dynasty of China. A young man named Na-mi leaves his demolished village to find his young sister, Ja-in, and her finance Su-koon, who were to wed on the very day of the attack. While on his mission to rescue her, he is being traced by Jushinta, a fierce Chung Warrior, and his band of malicious men who are out to stop him. Na-mi has but a day to rescue his sister before she is taken away to be a slave. When Na-mi finally finds his sister, Jushinta comes between them and a fierce battle between two of the finest warriors unfolds.