On the eve of the summer vacation of her senior year of high school, Shen Zhixia, who was about to transfer to another school, got closer and closer to Xu Shi'an, who had been paying attention to her silently after being divided into classes in her second year of high school. They got closer in every daily moment, and then got separated due to the changes in her family and the truth about her separation. It was not until they reunited many years later that they finally made up for the love they had not had time to express.