Shim Eun-seok, an elite judge with a cold and distant personality who is known for her dislike of juveniles, is appointed judge of a juvenile court in the Yeonhwa District. There, she breaks customs and administers her own ways of punishing the young offenders. Eun-seok has to deal with and balance her aversion to minor offenders with firm beliefs on justice and punishment as she tackles complex cases while discovering what being an adult truly means.