The Magical Sword of Skeletal Spirit(1969)

A man who left his wife to study for a government exam happens to see a drowning woman in a mountain and rescues her. To thank him she takes him home deep in the mountain. He ends up staying with her for years, putting his study behind. But she learns that the woman he saved from the drowning sea was a vampire. Meanwhile his wife finds where her husband is with the Buddha's revelation, kills the vampire and brings him back safely to their home.