17-year-old Cheng Miaomiao and 16-year-old Cheng Yaya were born in the No. 1 Oil Production Plant of Linqi Oilfield. Three generations of their family are oilfield workers. Their father, Cheng Pengfei, is an otolaryngologist, and their mother, Jia Daiyu, is a team logistics worker. The family moved from the northwest to the seaside base.Heping Town.

In the late 1990s, Miao Miao, with a longing for the outside world, took her childhood sweetheart Li Si and her best friend Hu Qiu Min, and planned to use the summer vacation of her first year of high school to embark on an adventure to go to Hong Kong to welcome the return of the country, but it failed.On the other side, the 16-year-old younger brother Cheng Yaya went to the back mountain for archeology and was almost regarded as a tomb robber.Mother Jia Daiyu had a headache, and the siblings also began their turbulent high school careers.

Cheng Miaomiao fell into a friendship crisis with Li Si, and her younger brother Cheng Yaya's class transferred Yuan Shanqing, the daughter of a wanted criminal. Yaya was the first to stand up and defend Yuan Shanqing from all sides.Children grow up amid changes.