17-year-old Cheng Miaomiao (played by Sun Qian) 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 whole family moved from the northwest to the seaside base Heping Town. In the late 1990s, Miaomiao, with a yearning for the outside world, took her childhood sweetheart Li Si (played by Zhai Zilu) and her bestie Hu Qiumin, intending to use the summer vacation of her first year in high school to start the adventure of "going to Hong Kong to welcome the return", but it was not a good start. On the other hand, the 16-year-old brother Cheng Yaya went to the back mountain for archaeology and was almost mistaken for a tomb robber. Mother Jia Daiyu was very troubled, and the siblings also began a high school career full of chickens and dogs. Cheng Miaomiao fell into a friendship crisis with Li Si, and her brother Cheng Yaya's class transferred to Yuan Shanqing, the daughter of a wanted criminal. Yaya was the first to stand up and resist the hostility from all sides for Yuan Shanqing. The children ushered in growth in the changes.