During a pursuit of a gangster, the brave detective Po had a misunderstanding with a motorist, who was later killed in a bar. Po was ordered to protect the deceased's girlfriend Shelly. The two had countless quarrels, but finally understood each other. At a banquet, Po discovered the murderer, but due to the large number of people at the venue, it was inconvenient to open the gun, causing the killer to escape. Finally, the killer came to Po and others to kill him. At the critical moment, Po killed the killer in self-defense and saved everyone.