In Yunzhou City, Lin Yan, a down-and-out ancient book restorer, guards the old store "Yan Zhitang". He is in huge debt and has to deal with the "civilized repair system" - he can see and repair the cracks in everything, but every time he uses supernatural means, he must give a scientific explanation of the nine-year compulsory education level, otherwise he will become speechless.
In order to pay off the debt, Lin Yan was involved in strange incidents such as the CBD Jumping Curse and the late-night subway ghost train. While using a carving knife to deal with the ghosts, he explained to reporter Su Wan that it was "infrasonic resonance" and "mass hysteria". With his "scientific Feng Shui", he became famous in Yunzhou, but he attracted the murderous intention of Zhao Xuan, the master of "Xuankong Pavilion". Zhao Xuan wanted to destroy the city's dragon veins to release evil energy and cultivate evil spirits.
After the struggle escalated, Lin Yan discovered that Yunzhou City was a "feng shui cage" to suppress ancient evil spirits, and the master aunt Gu Qingci whom he wanted to protect the most was actually the key to the seal. Zhao Xuan forced Gu Qingci to die, and he had to choose between "saving one person" or "saving a city."
In the end, on the night of the Babel Tower when hundreds of ghosts walked at night, Lin Yan gathered all the strangers in the city, used the city's power network as talisman and landmark buildings as the eyes, launched "city-level restoration", repaired the seal, used scientific lies to mend people's fears, and attributed the mysterious things to "scientific" silence, becoming legends hidden in the smoke of fireworks.
