ซีซัน 1・Only 29 men have reached No. 1 in the ATP rankings. This four-part documentary explores the obsession, sacrifice, and resilience behind that rare achievement. Spanning every era since 1972, it reveals the defining matches, rivalries, and personal costs that shaped these champions. More than titles and trophies, it uncovers what it truly demands to stand alone at the top of men's tennis.