Lin Xiaoyu, a 16-year-old stringer, huddled behind a locker in the arena. The oxygen cylinder of her pneumoconiosis-stricken mother resonated with the broken YONEX racket in the shadows. When retired national player Su Jing discovered that he was calculating air resistance formulas on the floor, his talents that had been corroded by life began to peel off - he used the laws of physics to decipher the tactical codes left by his father, and saw a turning point in the paradoxical serve of his mixed doubles partner Zhou Minghao, but was forced to build a line of defense between Chu Hang's 220 kilometers per hour smash and her mother's medical expenses. Every midnight, the ball thread wrapped around his fingertips is weaving the wings of a poor child, and the rusty championship dream will eventually fly into the wind before the calculator reaches zero.
