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A single father makes a living driving a truck while raising his daughter on his own. The truck is their mobile home—within this small space, they eat, sleep, and live. For the little girl, the truck is a moving castle that holds all of her childhood memories. Following her father and learning to help with work, she does everything with remarkable seriousness. Through life's hardships, they have only each other. With her small presence, she eases the loneliness of her father's long journeys. Thi