In the second grade of junior high school, Guo Yige was selected into a key class because of her excellent grades. Here she met Lin Xinji, who first sparked her love interest, and Zhang Qingchu, her best friend in junior high school. The first love and the first friendship were as clear as a river. In this elegy of youth, where should Yige's feelings towards Lin Xinji go. This is the story of a long secret love.