Te wu mi cheng (2001)

This action movie unfolds with the story of Bei, a salesman at a workout equipment store, who harbors dreams of adventures. It all starts when on one normal dull day, Bei follows his instincts to trail two suspicious looking men into an alley. When he realizes that these men are robbing a jewelry store, he jumps into action to foil their plans. Soon after Bei meets Liu, a private investigator who convinces Bei that he may be the long-lost son of a rich Korean businessman. In no time, Bei is on his way to fulfill his dreams of adventure and fortune travelling to Korea and even exotic Turkey. As Bei is drawn deeper into the game of cat and mouse, he realizes he has become the key to locating a lung cancer virus. With an assortment of characters fighting him along the way, will Bei succeed in finding the virus himself?