After outstanding public security officer Ye Feibai dies in the line of duty, he is reborn as a stray black cat and awakens the Cat Police Officer System. By solving ninety-nine cases, he can turn back into a human. He recruits Xiao Qi, a German Shepherd, a tiger, a hamster, and other animals to form an animal police squad. Together, they crack major cases involving human trafficking, telecom fraud, and cross-border crime, while taking on the mastermind behind it all, Uncle Hao. In the end, he embraces his identity as a cat and continues protecting the peace of the community alongside his companions.