The story takes place in the mysterious city "Mystery City". Bizarre cases occur every week in the city, from disappearances in secret rooms to identity changes. Du Zhifei accidentally helped the police solve an unsolved case, got acquainted with the police team, and formed a special case team. The team members have different personalities, and they occasionally quarrel with each other but have a tacit understanding. As the investigation deepens, they discover that there is a mysterious organization behind the mysterious case, and each case is related to their own growth, alienation, and humor to resolve stress. In the end, in an unprecedented "big mystery", several people relied on their own unique skills and laughter to completely solve the mystery of the mysterious city and become an urban legend. The whole book uses a humorous, compact and ups and downs rhythm to connect the independent and echoing major cases in each volume, and at the end all the clues are tied up at once, making it a perfect conclusion.
