Lin Yizhou's high school life was dull and chaotic, until the arrival of new student Chen Youqing quietly changed the atmosphere of the entire class. Lin Yizhou, his best friend Zhao Lei, and his deskmate Wang Taotao formed the campus "happy trio", causing trouble and making jokes along the way in studies, clubs, competitions, gossip, and trivial matters in life. At the same time, his secret love for Chen Youqing gradually became apparent, and the boundaries between friendship and love became increasingly blurred. With the guidance of senior high school senior Sun Yuanhang, they also embarked on their own paths of growth. Laughter and tears, farewells and goodbyes, three years of youth will eventually come to an end, and everyone will find their own answers in the intricate campus stories.