Lu Xiang, a freshman. Because of his negligence, his girlfriend was easily met with an accident. When he was regretting his decision, a mysterious trench coat wearing man appeared and told Lu Xiang that as long as he agreed to become a "Underworld Detective", Yi Lu could be "resurrected". Lu Xiang accepted. The man in the windbreaker placed a clock on Yi Lu's body, but the clock was turned upside down. As the clock turned, Yi Lu recovered. The man in the windbreaker promised that as long as he could keep track of the things that had been passed on in the underworld, he would be able to provide him with special energy. For the sake of his girlfriend, Lu Xiang had no choice but to agree to track down items from the Underworld. For the sake of "handling cases", he had been bestowed with a special sensing ability by the mysterious trench coat wearing man. Moreover, only after the case has been resolved can the professional "Soul Devouring Orb" be used to retrieve the items from the underworld.