Charlene Choi Tsoek-jin is a Hong Kong and Canadian actress and singer. She is a member of Hong Kong pop duo Twins, along with Gillian Chung.

The Twins Effect, also known as Vampire Effect in the United States, is a 2003 Hong Kong martial arts comedy-horror film directed by Dante Lam and Donnie Yen. The film was derived from the Cantopop gr