Tang Yuan, a white-collar worker living in poverty, awakens to the ability to understand the language of the four pests - rats, cockroaches, flies, and mosquitoes. From then on, her world is completely turned upside down. What others saw as pests turned into "intelligence agents" all over the city in her ears. When she accurately pointed out the identity and hiding place of the real murderer with these "metaphysical clues", the entire crime team was shocked and hired her as a special consultant to the police station. From then on, serious cases and troubles came to Tang Yuan one after another. Tang Yuan also used his "Four Pests Intelligence Network" to help the police successfully catch the murderer. Tang Yuan, who was initially questioned as a "wonderful consultant", gradually became the team favorite protected by all members of the crime team.
