Tells the story of Gu Qianling, a young and promising county lieutenant, Duan Chao, a thoughtful and truth-seeking widow, and Shang Yu, a lively and playful illusion master. They met because of a case and were accidentally involved in the villain Cui Qian's murderous conspiracy. Gu Qianling and Duan Chao worked hard to solve mysterious cases, and gradually changed from mutual dislike to mutual support. In the face of difficulties and tests, the trio went from being incompatible to fighting side by side. The three of them continue to solve crimes, punish the brutal villains, track down the real culprits, and protect the peace of the world.