"ALONE" tells the story of Pim who moved from Thailand to Korea to flee the guilt to be the surviving half a twin. Flashbacks to the childhood of Pim show the bittersweet partnership with her sister, along with their devotion to keep together indefinitely, transforms in to a repressive bond that results in a separation. The soul of her deceased sister angrily thrusts herself to the life of Pim after she returns to visit her mother.