Lu Xiao and Meng Yao, classmates at a university in Jiangnan, fall in love at first sight. Yang Yu, who has long pursued Meng Yao, shares a close bond with Lu Xiao over their love for basketball, while Zhu Na passionately chases after Lu Xiao. As these relationships unfold, a mysterious figure quietly intervenes, sparking a series of events that entangle them for the next twenty years.