Zhou Xiao, a caddy for five years, stole the tactical skeletons of ten coaches with his eyes and memorized the breathing rhythms of thousands of games with his silence. When talented coach Lin Yan accidentally picked up his notes, a silent tactical revolution quietly detonated. Chen Tieshan's iron-fisted suppression, Su Rui's extreme training, Luo Zhao's arrogance and provocation, Lao Zhong's ancient key - all forces are pushing him towards the ultimate showdown that is destined to be ignored by the mainstream. He is not a player, but he wants to reconstruct the rules of tennis as a ball boy.
