On the border, a promising capture operation unexpectedly failed, resulting in the sacrifice of an undercover police officer named Da Fa. Before his sacrifice, Da Fa sent back intelligence revealing that drug dealers were carrying out the largest heroin transaction in Asian history.
The Director of Luoshan Public Security Bureau, Fang Guoan, took this intelligence very seriously and prepared for action. However, before planning a new operation, more and more evidence showed that Ye Chunsheng, the pre-trial officer of the anti-drug team, was the mole planted by the drug dealers. Faced with overwhelming evidence, Fang Guoan ordered the secret arrest of Ye Chunsheng. Upon learning that his actions had been exposed, Ye Chunsheng hastily fled, broke through the police's multiple layers of encirclement and capture, rescued the drug dealer known as "Little Cannon," and successfully fled across the border.