In the last soccer game in school, Xia, waiting for her best friend Jun who was late, tried her best to play a draw and get the game into overtime. They kept the promise of playing the last game together in the injury time, which became a memory of the last time the childhood friends met in their lives. In my childhood, all friendships are not about class, rich or poor, winning or losing. All things are very simple before the end of that summer.