Alone

Alone (, or Fad, literally "twin") is a 2007 Thai horror film written and directed by Banjong Pisanthanakun and Parkpoom Wongpoom. Alone stars Thai-German pop singer Marsha Vadhanapanich in her first film role in 15 years. Plot Pim and Ploy are twin sisters both conjoined at the stomach. Pim is very sweet, caring, and protective, especially of Ploy, though Ploy's nature is generally harsh and cold. The girls have a very close bond and promised each other to stay together until they die. While they are staying in a hospital, Pim and Ploy meet a boy named Wee. The girls display mutual affection for him, but Wee only confesses his love for Pim, much to Ploy's jealousy. After his recovery from an illness, Wee decides that he wants to see Pim one last time before leaving the hospital and visiting the twins' room. As much as Pim wants to see Wee, Ploy refuses to get out of bed in an apparent jealous rage. Wee gets upset and leaves. Angry and in tears, Pim demands that she and Ploy be separated. To do so, the twins undergo surgery, which Ploy does not survive. Pim burdens herself with guilt thinking that if she had not wanted an operation, Ploy would still be alive. Years later, Pim has married Wee and the couple live in South Korea. She receives a phone call from Thailand that her mother has had a stroke. When Pim and Wee return to Thailand, a series of strange events begin to happen, and Pim believes that the ghost of Ploy is behind them all. When she tells Wee her theory, he becomes very worried and starts seeking psychiatric help for Pim. But even after the psychiatrist came to visit Pim, she still experiences the hauntings, and what Wee believes to be hallucinations. The hauntings escalate from moving objects and voices to Pim coming in contact with Ploy; Pim hears her breathing on her side while she sleeps, she sees Ploy in the mirror instead of herself, while on an elevator she sees Ploy resting her head on her shoulder, and is nearly drowned by Ploy while taking a bath. Pim feels incredibly guilty and becomes a recluse, with Wee not being very sure about what's wrong with her. However, Ploy's ghost then begins haunting Wee as well.