Out Live (2000) on Netflix

In the Yuan Dynasty, the Mongolian Empire with the descendants of Genghis Kan rules China. In this environment, the poor Jinha is raised by his uncle that teaches him the secret martial art of the Bichun. The daughter of a concubine of the powerful General Taruga, Sullie, is raised with him and they have a crush on each other. When her mother dies, Sullie's father brings her to the Taruga House and she tells Jinha that she would wait for him. But the general promises her to the powerful Chinese lord Namgung Junkwang to increase his power with the alliance. When Jinha's uncle is lethally wounded by warriors that want to know the secrets of Bichun, he discloses the Korean royal origins of Jinha. While traveling to meet Sullie, Jimha befriends Junkwang without knowing that he is the man that will marry Sullie. Sooner Jinha is betrayed and almost dies; along the years, he fights against the Mongolian Empire. When he meets Sullie again years later, she discloses a family secret to him.