In the gray area of modern cities, five professionals with different backgrounds gathered for different reasons to form a folk suspense reasoning team. They assist the police, victims and the public in solving complex cases, including serial murders, disappearances, social hot spots, and mysterious and mysterious cold cases. There is an unknown truth hidden behind each case, and the team members also carry heavy pasts and inner scars. Following the clues of an unsolved case that has not been solved for ten years, the team continues to struggle between darkness and truth, trust and betrayal, justice and compromise, and gradually exposes the deep injustice and corruption in society. In the end, in the vortex of conspiracy against the reasoning team, they complete self-salvation, mutual dependence and growth, and uncover the biggest secret behind the case.
