In the summer of 2000, Ma Si Yi, a ten-year-old girl whose life is a mystery, arrives at Flower Street by the canal. Due to her extraordinary appearance, she became the most popular person on Flower Street. Three teenagers, Xie Wang He, Xing Chi, and Hai Kuo, have always been around Ma Si Yi, standing up for her when some punks come to harass her. After an accident in high school, Ma Si Yi's brother and grandmother passed away, and Ma Si Yi disappeared. Chen Rui stays in his hometown for school, while Xie Wang He, Xing Chi, Hai Kuo, and Da Hua Zi reunite in Beijing. Da Hua Zi has contracted a delivery point, Xie Wang He works for an internet company doing local life services, and Hai Kuo works as an engineer in another big internet factory. Only Xing Chi is still muddling through his days. Because of the sudden appearance of Ma Si Yi, the young boys and girls who grew up together come together again. However, the pressure of competition and life has put them all in a state of confusion. After eight years of absence from their hometowns, the teenagers of that year return to Flower Street on the Canal one after another, except for Ma Si Yi. But just when everyone sees the hope of a new life, Ma Si Yi is also on the way back.
