Movie Story : A single mother who teaches swimming raises her seven-year-old daughter, So-hyun, but their home life unravels after a series of tragedies, including the death of the girl's puppy after a fall from their apartment. As So-hyun's bullying and unusual behavior continue at school, her mother struggles to get her the help she needs. Twenty years later, Min, who handles unclaimed bodies, forms a close bond with a new coworker, Hae-young.