Directed by Mo Hong-jin, the director of "Waiting for You", the film tells the story of a 19-year-old girl, Yun-young, who lives with her hearing-impaired mother, works part-time, and prepares for exams. When preparing for the civil service exam, she becomes a murderer due to an accident. In prison, they are called "037". In a desperate situation, the people in cell 10, each with their own story, reach out to protect Yun-young.