It tells the story of Doo Ri, a ten-year-old girl who, following her parents’ divorce, starts a new life in Musan with her mother. She learns to lie with ease in order to fit in with the small school community. Those around her, including her classmate and friend Min Ah, try to protect her. Doo Ri and Min Ah even devise a plan to cover up Doo Ri’s lies. Will the two girls manage to keep their classmates’ lies a secret until the very end?