In an imaginary modern city called "Yuan City", a private reasoning investigation team "Mist Investigation Team" composed of former police detectives, psychologists, hackers, forensic doctors, private detectives and newcomers was born. They accept suspense cases that cannot be solved by civilians and the police, from serial murders and cold case tracking to corporate espionage and political and business secret wars. Every search for the truth is a re-examination of human nature, justice and team trust. As the case progresses, multiple main lines gradually emerge: the members' personal pasts, social undercurrents and a mysterious "black box case" are secretly intertwined. All clues finally converge on a super mystery that has been hidden for many years. The team members are also growing in a crisis of cooperation and trust, facing the test of fate.
