Musa, released as both The Warrior and The Ultimate Warrior in English-speaking countries, is a 2001 South Korean epic action drama film directed by Kim Sung-su, starring Jung Woo-sung, Ahn Sung-ki, Joo Jin-mo and Chinese actress Zhang Ziyi. The semi-historical story follows the adventures of a Korean peace delegation as they try to get back to Korea through the inhospitable deserts of northern China.

Jung Woo-sung is a South Korean actor and the first Korean UNHCR Goodwill Ambassador. Jung started his career as a fashion model, rising to stardom and teenage cult status with the gangster film Beat (1997), for which he won Best New Actor at the 17th Korean Association of Film Critics Awards.