Sun Wukong is a monkey born from a heavenly stone who acquires supernatural powers. After rebelling against heaven and being imprisoned under a mountain for 500 years, he later accompanies the monk Xuanzang on a journey to India. Thus, according to legend, Buddhism is brought to ancient China.

Detective Sergeant Ma Jun, known for dispensing his own brand of justice during arrests, teams up with an undercover cop, Wilson, to try and bring down three merciless Vietnamese brothers running a smuggling ring in the months before mainland China's takeover of Hong Kong. Jun pursues the gang tirelessly, sometimes ignoring police protocols. A showdown is inevitable!

Twenty years previously, Chu Sha Kiu met an undergraduate from Hong Kong, Chuk Chin Fai and they immediately fell in love with each other. However soon afterwards, Fai decided to further his study in the United States. Kiu, though had just found herself pregnant, agreed reluctantly to let him go just for the sake of his future.