The Twins Effect, also known as Vampire Effect in the United States, is a 2003 Hong Kong film directed by Dante Lam and Donnie Yen. The film was derived from Cantopop group Twins, starring both members Charlene Choi and Gillian Chung in the leading roles. Co-stars include Edison Chen and Ekin Cheng. Jackie Chan makes a special appearance in the film as well.
Following its release on March 8, 2003, The Twins Effect was a box-office success in Hong Kong, became the highest grossing domestic film of the year. The film gained huge popularity, mainly from fans of Twins.
An evil vampire duke seeks to kill and collect the blood of a royal family of European vampires in order to become all powerful. The last surviving member of the family, Prince Kazaf, flees to Hong Kong with his servant Prada. There, they are introduced by estate agent Momoko to live in an abandoned church.
Vampire hunter Reeve is depressed after his partner Lila is killed by vampires. He decides to train Lila's younger sister, Gypsy, to inherit her sister's duty and fight the vampire duke. However, Reeve's own sister, Helen, sees Gypsy as a rival.
At the same time, Kazaf meets Helen and falls in love with her, after
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