It tells the story of Doo Ri, a ten-year-old girl who, after her parents’ divorce, starts a new life in Musan with her mother. She learns to lie with ease in order to fit in at her small school. Those around her, including her classmate and friend Min Ah, try to protect her. Doo Ri and Min Ah even come up with 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?