He Was Very Busy as a Senior Detective

Lucas graduated from the police school with excellent grades and entered the police station, but he was arranged to work that had nothing to do with the investigation. Being involved in the director's death, Lucas activated the full-level detective system to travel through the time at will. As a famous detective in history, as long as he could infer and solve cases, the system could be upgraded. There were cases of headless female corpses in the sewer, corpses in the library, brutal killings in the elevator in the apartment building, and cases of girls in red in the countryside Three years later, the system reached its full level and Lucas graduated. Piles of odd cases and consecutive murders all pointed to a mysterious organization! The head of the police station said, "Since Lucas joined the police station, he has solved all the unsolved cases in the city.".