Lin Zhiyuan, a senior repeater in high school, died because his mother, who had always loved him, passed away, and his father remarried. He was not tolerated by his stepmother. In order to attract his father's attention, he behaved surly and often got into fights and got into trouble. Until the arrival of a sweet and comely substitute teacher, he changed. He developed a secret love in contact with the teacher. When he was about to confess, the substitute teacher received a mysterious phone call and disappeared overnight. Lin Zhiyuan has since embarked on the road to find a substitute teacher...