17-year-old Cheng Miao Miao and her brother, 16-year-old Cheng Ya Ya, were born in the No. 1 Oil production plant of Linqi Oilfield. Three generations of their family are oilfield workers. Their father, Cheng Peng Fei, is an otolaryngologist, and their mother, Jia Dai Yu, is a team logistics. The whole family moved from the northwest to the seaside base, Heping Town, in the late 1990s. Miao Miao, with a yearning for the outside world, pulled her childhood sweetheart Li Si and her best friend Hu Qiu Min, 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 city's return to the motherland", but failed. On the other hand, her brother Cheng Ya Ya went to the back mountain for archaeology and was almost mistaken for a tomb robber. Mother Jia Dai Yu often felt worried, and the siblings began their high school life, which was full of chaotic moments. Cheng Miao Miao fell into a friendship crisis with Li Si. In Cheng Ya Ya's class, there's a newly transferred student named Yuan Shan Qing, and she is the daughter of a wanted criminal. Ya Ya was the first to stand up and resist the hostility from all sides against Yuan Shan Qing. The children ushered in growth in the changes.