His sudden fame catches the eye of , a private investigator who claims Buck might be the long-lost son of a wealthy, dying Korean businessman. Hoping to finally find his family, Buck travels to South Korea to meet the man. On his deathbed, the man—actually a former double agent—challenges Buck to a "game of hide-and-seek," leaving him a series of cryptic clues. The Global Hunt

In a desperate race through the streets of Istanbul, Buck must use his martial arts skills and environmental ingenuity—including a famous scene involving a makeshift parachute made from an umbrella—to secure the virus. After a high-speed chase involving a burning oil tanker, Buck barely survives, only to realize that the entire "game" was a elaborate sting operation by an intelligence agency to recruit him as an unofficial operative.

Buck Yuen may have started as a salesman, but he ends his journey as a true, albeit accidental, spy.