Huang Wenzhan's "Goutou" (Ren Dahua) and he Jiabao's "Pig Girl" (Xu Zishan) are employees of Hong Kong CIB (Criminal Intelligence Bureau). CIB is commonly known as the paparazzi of the Hong Kong police, in which everyone has a low-key and ordinary appearance, but has an extremely keen sense of criminals. The mission of Goutou and Pig Girl is to track down the suspect Chen Zhongshan (Liang Jiahui) in the jewelry robbery. Chen Zhongshan is a criminal "genius" who has rich experience and ingenious means to evade the police. This CIB operation is more arduous than usual. Although the police have ambushed on all sides, Goutou and Pig Girl have tried their best, Chen Zhongshan has repeatedly escaped. Stalking all the way is like cat and mouse, endless. Chen Zhongshan seemed to have magical powers and smelled the police chasing him. Seeing that some police officers were killed in the course of tracking, the dog head and pig girl were very anxious.