In the 1980s, there were old alleys in the town. The young Lei Zhiming (played by Chen Sicheng) rides a bicycle through the streets, wild and unruly. Zhiming's girlfriend Er Dong (played by Gai Ran) wants to find a good family to marry out, so that the family can live a good life. The quiet and introverted female high school student (Shen Jiani) cheated on an exam and was found out by the teacher. Yiyou Wei Tiemin (played by Zhang Xinyi) rushed forward to help take care of him, and finally failed the college entrance examination. At this time, the young Jiang Lin (Zhang Zichen) who has been pursuing Wei Tiemin can finally become a formal worker. At this time, the story has just begun. How did a few reckless teenagers know that ten years have been intertwined with too many tests of feelings and friendship. Times change, love is a bullet of happiness.