Su Nianwei's sophomore year of high school is turned upside down by a class assignment list: she ends up sitting in front of and behind Jiang Yu, the school's most talked-about student. He shines like the blazing midsummer sun, while she is used to hiding in the shadows of the written word. An accidental collision during a basketball game opens a crack for romance, and a "fake couple" pact at the school cultural festival brings them even closer.
He uses their pact as an excuse to walk her home. The moment their shoulders touch beneath the umbrella, she hears her own heart pounding deafeningly. She secretly mends the hole in his basketball sock, hiding all her unspoken feelings in every stitch. Then the first bell of senior year rings, and transfer student Xu Zhe's admiration for her sends Jiang Yu into a jealous frenzy. The pressure of studies and dreams also brings friction to the two, who are only just beginning to experience love.
Beneath the night sky of the fireworks festival, Jiang Yu finally takes her hand. "Su Nianwei, I can't keep pretending anymore... because I've already fallen for you for real." On a summer day, their university admission letters arrive, and they stand hand in hand amid the crowd at their graduation ceremony. The shadows of the plane trees sway as the young man traces a promise into her palm: "From the classroom to the future, you will always be my final destination."