Description：Middle school girls Xiaobu (played by Li Lu) and Anqi (played by Yao Anqi) used to be an inseparable couple. They were the only two girls in the school who smoked. Their relationship was as erratic and addictive as tobacco. They often shared their fantasies with each other on the swings in the secret base, until one day, they quarreled and stopped communicating. Xiaobu fell off her bicycle and met her future boyfriend, Case, who practiced boxing. They often went out with Xiaobu's friend Ami (played by Liao Qianhui). Xiaobu didn't know that on a boring summer afternoon, Case fell in love at first sight with Ami on the dance machine... Although Xiaobu is no longer in contact with Anqi, the memory of the latter often makes her deeply emotional. From the past to the present, the knot of fate of these four young people has never been separated, and has always been entangled in them in an obscure way.