The novel is mainly about the male lead, Du Yunsheng, and the female lead, Li Ziying, who meet at the Hu Hui Middle School's hundred-day countdown ceremony for the high school entrance exams. Rumor has it that the male lead is a playboy, and the female lead doesn't want much to do with him either. The entrance exams come and go in a flash. Li Ziying, whose grades have always been average, unexpectedly earns her best scores in three years. Before long, not only is Li Ziying thrust into the spotlight, but so is the "second young master of Hu Hui," whose performance suffered because of upheaval at home. When high school begins, they end up in the same class and gradually get to know each other. Li Ziying can clearly feel that Du Yunsheng seems to have changed a lot, yet somehow hasn't changed at all. They fall for each other, but disaster strikes, and they are forced apart. They make a ten-year wager. During that time, the male lead gets engaged to the female lead's cousin. In the eighth year, when the male lead is on the verge of death, they meet again, and he loses the wager. The female lead is devastated. Afterward, her mind often wanders, and she frequently gazes absently at the desks and chairs in the No. 2 Middle School classroom and the scenery around the school, holding on to their memories.
