In September of Qingcheng Middle School, with the ginkgo leaf bookmark left by her mother, the transfer student Su Wan stepped into class 3 of the second grade of high school with a crumpled notice in her hand, and became the classmate of Lu Ze, the top student who was lying on the table solving math problems. A fallen ginkgo bookmark unexpectedly brought out the two people's shared memories - the 300-year-old ginkgo tree in the west of the city was where Su Wan and her mother once enjoyed autumn, and it was also the scenery next to Grandma Lu Ze's old residence. This subtle connection gradually brought the two people who were originally estranged closer together: the news about solving problems in the evening self-study, the tilted black umbrella on a rainy day, the figure helping someone after an injury in physical education class. The warmth of youth quietly spread in the hearts of the two. Su Wan hid her feelings for Lu Ze, and Lu Ze also secretly took her emotions into his heart under his cold appearance.
