I want a movie, a female lead with split personality disorder, a teacher during the day, her sister at night, often going to bars.

The name of the film is Dual Identity, an American horror film released in 2008 directed by Julian Emsley. The following is the introduction of the film: The film tells the story of a woman with a double identity. Her name was Emily, and she was a successful high school teacher, but at night, her personality would mutate into that of her younger sister. The younger sister, Emily, was an innocent and lively girl during the day, but at night, she became extremely fierce. She began to become violent and attacked her family. Emily had to find a balance to control her behavior in the chaos of her double identity. Dual Identity received good reviews from film critics and audiences, and was hailed as a successful horror film. Its plot and acting were excellent, and it also explored topics such as schizophrenia.