Chan Chi-Lung has been an infiltrator in Cheung Mo-Hung's Hong Kong triad gang for many years. After a failure of a recent negotiation by Lung with the other three local triad gangs on behalf of Hung makes the latter suspicious of Lung's identity. Hung sets to wipe out every undercover cop in his gang and as a result many cops are caught and wiped out. Sensing the danger, Lung requests to put an end to his undercover career from his captain, Cheung. However, Cheung sends Lung to Mainland China to infiltrate a business of "Special Identity" trading instead. The business is run by Hung's best protégé, Sunny, who was Lung's previous buddy in the gang. Cheung promises to reinstate Lung's police identity in conclusion of the mission once Sunny's business breaks down. Lung agrees, and joining him are local police officer Fang Jing and her chief Lei Peng from the Mainland Chinese police force. But before they can get to Sunny, the latter suddenly vanishes leaving Lung exposed and in great ... Written by DooK

Michael is a cop chasing uncommon serial killer Sung Ping, who one day kills off a scummy triad on almost a whim. Liking the aftermath, he proceeds to plan his next few killings much to the dismay of the local triads. Meanwhile, reporter Hak makes the real-life crime drama the fodder for his crime fiction serial. Before long, Ping begins using the fiction to fuel his own plans, and soon Hak is concerned that he may be responsible.