In the alleys of the old city late at night, there is a "Weird Detective Agency" that only operates from midnight to four in the morning. The shop owner Chen Mo, a seemingly ordinary thirty-year-old man, is actually the last "trickster" in the contemporary era - a special being who can communicate with urban legends and folklore. He has no system or golden fingers, only ancestral skills and keen observation. In a modern society with advanced technology, he deals with "urban anecdotes" that cannot be explained by science.
When a seemingly ordinary disappearance case involves the centuries-old legend of the "ghost in red on the subway", Chen Mo discovers that behind these urban ghost stories, there is actually a mysterious organization trying to reconstruct the boundaries between reality and illusion. In the notebook left by his late father, the sentence "When all the legends of the city wake up at the same time, the boundary between reality and fiction will completely disappear" is gradually becoming a reality...