After robbing a gold shop in the daytime, three thieves from the mainland who came to Hong Kong fled in panic when they encountered a patrolman. One of them fled into a building where another gang of mainland bandits who had been wanted by the police for a long time and equipped with powerful firepower were hiding. Then, the fate of the police's serious crime team was accidentally implicated by the two gangs of gangsters. When they thought they could relax and celebrate after successfully killing the gangsters, they ran into the two thieves who escaped. After a round of melee, things suddenly became very sudden. The love line that developed in parallel with the main line of the police and bandits' battle also came very suddenly. The key members of the serious crime team, Zhong Jian (Simon Yam) and Li Sen (Lau Ching-wan), happened to meet the owner of a tea restaurant they knew before when they were handling the gold shop robbery case. As for who her heart belongs to, everyone guessed and got a surprising answer.