Su Mo, an ordinary social worker living in a modern city, accidentally walked into the midnight ghost market after drinking and was involved in the supernatural chaos. He was targeted by Wuchang Lao Li, the messenger from the underworld. At the same time, he got acquainted with Ah Li, a fox demon disguised as a cat, and Shen Qinghe, a cold and charming spiritual medium. He overcame thorns in strange incidents one after another, and used humorous and hard-core methods to solve problems. Three people and one demon, from exorcism and mystery solving, revenge of wronged souls, to going deep into the shadows of the city, uncovering layers of fog such as ghost markets, paper lanterns, ownerless souls, etc., They also gradually discover the mastermind hidden behind the scenes, the perverse entrepreneur Wei Hansong and his collusion with the underworld. Across Yin and Yang, the protagonist, in the process of exploring the truth and self-growth, finally shattered the conspiracy and maintained the balance between the human world and the underworld - and he himself also found friendship, love and self-worth in the supernatural world.
