The film was derived from Cantopop group Twins, starring both members Charlene Choi and Gillian Chung in the leading roles.

Released on 8 March 2003, The Twins Effect was a box-office success in Hong Kong, becoming the highest-grossing domestic film of the year.

The last surviving member of the family, Prince Kazaf, flees to Hong Kong with his servant Prada.

At the same time, Kazaf meets Helen and falls in love with her, after which he intends to lead the life of a human being, but he is tracked down by the duke.

After its release in Hong Kong, the film was renamed to Vampire Effect and some sequences were slightly altered.