Detective Li SIR is about to retire, but he met a gangster who came to Hong Kong from the mainland to rob jewelry. The female gangster Song Ling hid the jewelry in the elevator, and Ling's boyfriend awei snatched Li SIR's gun. Police reinforcements arrived, Song Ling was arrested and Wei was forced to flee. He hid in a taxi driver, and marijuana became a home, and marijuana became a usury. His son Alei is autistic and his daughter Aron has sex. In order to avoid complications, Wei sent away the door-to-door debt collector and her boyfriend who asked to break up with Rong, making marijuana a family with a good impression on Wei. SIR Li didn't want to be influenced by losing his gun when he retired. He wished he could get it back. Li escorted Song Ling, and Wei planned to rescue him. Unexpectedly, bandit leader A Guang and his companions robbed Song Ling, and Master Li forced Song Ling to tell the whereabouts of the jewels. The light is fierce. Li Heling should keep silent and keep the jewels for himself. Wei only has a police gun of SIR Li, but he wants to challenge the powerful firepower of A Guang and his party.