Three young men with special skills were involved in a series of bizarre cases due to an old unsolved case - someone disappeared in an empty dark room at midnight, someone received a strange express delivery announcing death, and behind each case, the same mystery pattern quietly appeared. In the process of discovering the truth, they not only face thrilling dilemmas beyond common sense, but also face various tests in the shadow of human nature. Through open and secret fights and humorous complaints, the shocking secrets hidden under the surface of the town are revealed step by step. In the end, as the mystery was solved, everyone finally understood that the source of all this is the 'black room' that lingers in everyone's heart...
