In her senior year, Du Xiaoyu, who suffers from skin allergies, transferred to Class 2, Senior 3, Dinghai Middle School. She sat at the same table with Lu Zheng, who loves music, and her life changed dramatically. In this short but long year, some people left and some joined, including the sunny and warm boy He Zhizhou, the tomboy Guan Xin, the ordinary Wan Shitong, the willful but kind Zhao Yuner... A group of teenagers with different personalities experienced the growth and transformation of family, friendship and dreams together, from strangers to building deep friendships with each other. Out of a common musical dream, they formed the "Crouching Tiger, Hidden Dragon" band, and when the college entrance examination came, they also came to the fork in their dreams. After many years, everyone went to a music festival at the same time, completed a late performance, and made up for the deepest regret in their youth.