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Saya (Jun Ji-hyun) looks like an ordinary teenager on the outside, but on the inside, she's a 400-year-old half-human, half-vampire swordfighter who's made it her mission to exterminate vampires. Sent to an American military base in Tokyo, Saya learns that she may finally have a chance to destroy Onigen, the evil vampire leader. But when she forms a friendship with the daughter of the base's commander, she realizes that her ability to bond with humans may be her greatest weapon against Onigen. Wikipedia