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Wong Kai-chung (played by Eason Chan) and Lee Yiu-tang (played by Andy Lau) are two case officers in the major crimes unit who don't know each other. Chong is carefree and unpretentious, while Ting is sharp, cunning, and self-important. These two officers with vastly different personalities are brought together by a case, with female officer Feng Baobao (played by Winger Cheng) temporarily becoming their superior. The case is triggered by Ken (played by Peter Huang), who, along with his girlfriend, plans to steal a priceless piece of jewelry and then retire from the underworld. However, their plan is foiled when another group of criminals notices the stolen treasure. They chase and capture Ken, while his girlfriend escapes with the jewelry. She then approaches the police with a request: she is willing to exchange the necklace for Ken's safe return. The police begin to investigate the gang responsible for kidnapping Ken. During this process, Chong, Ting, and Feng Baobao have differing opinions and constant conflicts. The investigation faces numerous difficulties.