"ALONE" tells the story of Pim who transferred from Thailand to Korea to escape the guilt to be the living half a conjoined twin. Flashbacks to the youth of Pim show their commitment to stay together indefinitely, and also the bittersweet romance with her sister, transforms into a repressive bond that eventually contributes to some separation. When she returns to visit her dying mother, the spirit of her dead sister thrusts herself into the life of Pim.