Koo tae song loke (1994)

One night, a young man Ken crosses path with a woman with amnesia. Unbeknowest to both of them, the woman, named Larn by Ken, is a vampire. When her relatives find and reveal the awful truth to her, she flees from Ken, despite having falling hopelessly in love with him. Ken is adamant about winning his lover back from her kins and willingly risks his own life to find her in the vampires' lair.