Alone (2007)

Conjoined twins Ploy and Pim are very close until Pim meets a boy named Wee, causing her to decide to separate from Ploy. The surgery is performed but Ploy does not survive. Years later, Pim and Wee are living together in South Korea when Pim suddenly has to return home to take care of her mother after she has a seizure. While back home, Pim is haunted by a ghost from her past.