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SONG San lives on a rural ranch, spending her days helping her father, Ki-yeol, tend to the sheep, and playing freely in nature. Although her life appears idyllic from the outside, she carries a quiet emptiness inside. She feels that her mother, Sun-hee, gives most of her attention to her older brother, SONG Pul, who has a disability. As her longing for her parents' undivided love grows stronger, San overhears her father considering whether to send Pul to a group home. From that moment on, she begins to devise a small, secret plan.