The background of the story is the modern urban "Deep City", where a folk suspense reasoning team was born. They each have their own expertise, but come together for different reasons. The team has dealt with a number of bizarre cases one after another, including serial murders, disappearances, misplaced identities, social undercurrents, etc. Behind each case there is an undercurrent of complex human nature and power. In the process of deciphering the truth, the team members encountered growth, hope and cracks. Their mutual trust and suspicion were constantly tested, and they also constantly uncovered the exploration of urban social contradictions, justice and truth. As the case deepens, the main line gradually points to a major unsolved case that has been sealed for many years. The secrets hidden among the members gradually surface, and finally usher in the ultimate showdown between fate and the truth.
