On the surface, Chen Yan is a rational detective of the city's criminal investigation team, but in fact he is a descendant of a fairy who hides in the city. He possesses the golden finger of the "Qi Observation Technique" inherited from his family and can see through the traces of evil spirits.
The evil stepmother covets his family's fairy token, and joins forces with her green tea cousin to pretend to be weak and sympathetic, and secretly conveys news to powerful ministers; the powerful "Zhao Bureau" appears to be a high-ranking police officer, but is actually a villain who practices sorcery, trying to seize Chen Yan's inheritance and dominate the world of immortality.
When Chen Yan relied on rational thinking and Qi-gazing skills to solve the unsolved case of a serial fairy tale, he accidentally got entangled with the "evil sect" female killer Su Qingyi - he saw through her identity, but couldn't help but be attracted by her struggle and helplessness. As the investigation deepens, Chen Yan's identity as a fairy gradually falls off his horse. The collision of good and evil positions and the revelation of family secrets put him in a dilemma...
