On the first day of the second year of high school, transfer student Su Wanxing knocked over the notebook of Lu Shiyan, the number one in grade. The wrong annotations hidden in the elegant handwriting got wet, which also opened up the two completely different youth trajectories. Su Wanxing has the sensitivity of his native family and is used to recording emotions in drawing books; Lu Shiyan carries the aura of a top student, but is trapped in his mother's high-pressure expectations. From "helping each other on wrong questions" in class to accidental companionship on the way to school, from unexpected support at sports events to watching the snow side by side on New Year's Eve, the wood grain of the old desks is carved with subtle heartbeats. They once had a cold war due to misunderstandings and argued over the pressure of entering a higher school, but they found courage in each other's eyes - Su Wanxing dared to show him the secrets in the painting book, and Lu Shiyan was willing to fight for her once the order "must take the Qingbei exam". When the summer wind blows through the classroom again, the scratches on the old desks are still there. Young girls have already learned to protect this dust-free love with the sincerity of youth.