Prior to the adoption of Confucianism, it was the tradition to abandon one's parents on a mountainside if they were over 70 years of age. In the ancient kingdom of Goryeo, now modern Korea, a nobleman defies this tradition when he refuses to leave his mother to starve to death.

Yu-ri falls in with a group of wild teenagers and is soon imitating their behavior. She takes to skipping school and in a short time, her parents are unable to control her. One night, her parents are forced to turn Yu-ri over to the police. They receive instructions from a specialist in juvenile delinquincy on how to deal with their daughter.