Tang Yuan, a girl living alone, awakens a special power - she can understand the sounds of mice, cockroaches, flies, and mosquitoes. A neighbor was killed late at night and the case reached a deadlock. She relied on rats to reconstruct the murderer's escape route, and used cockroach testimony to dig out key hidden evidence, making it impossible for the serial murderer to escape. From killing a wretched boss in the workplace, to solving an unsolved case that had been hidden for seven years on a rainy night, to tracking down a kidnapping case and rescuing hostages alone. The "Four Pests" that everyone avoids have become her all-pervasive ace informants. The bounty was collected and her family was separated. Just as she was living a peaceful life with her "Insects and Rats", a series of murders from a neighboring city were invited, and she was involved in a more dangerous mystery.
