When a son attempts to reconcile with his father, a series of fateful events allow him to experience the father's life in the past.

Tiezhu (Li) is a private eye recruited by the police to investigate the criminal activities surrounding action icon Yuen Bao (Chan). A long-time fan of Bao’s, the asthma patient Tiezhu can hardly believe his luck when he saves his idol’s life during a set accident. But as the two become friends and Tiezhu is brought in to reshape the sci-fi action film that Bao is working on, Bao’s sneaky manager, Tai (Danny Chan Kwok-kwan), is determined to turn his action crew into drug traffickers.