Under the magnolia tree in Jiangcheng No. 1 Middle School, Qi Huan and transfer student Chen Rang met unexpectedly. From the secret competition in the competition class to the tacit understanding of the classmates, from walking together in the rain to agreeing to go to A University together, young feelings quietly grew up in the side-by-side struggle. However, family changes caused Chen Rang to give up the college entrance examination, and the two took different life trajectories. They reunited many years later, and although they could not stay together, the youthful time that illuminated each other eventually became the most precious mark in each other's lives over the years.