Please remember, never dig out those unsolved mysteries. Because you will never know how much people at that time paid to cover it up. Beneath the false calm surface, most of the truth lies It's cruel... Well, let me put it more clearly. If one day, you see a book dropped on the floor on the way from work, hold your curiosity, and don't touch it ...... Unfortunately, Zhou Yan didn't realize this at first. So he picked up the book. The book has a very awkward name——'Famous Detective Practice Manual' As for the author ...called Fat Melon.