Remember, never dig into unsolved mysteries. Because you will never know how much people at that time paid to cover it up. Under the surface of false calm, most of the truth is cruel... Okay, let me put it more clearly. If one day you see a book falling on the ground on your way to get off work, your curiosity will be tied up and you must not touch it.
... Unfortunately, Zhou Yan did not realize this at first. So he picked up the book. That book has a very awkward name, "The Detective's Training Manual." As for the author... His name is Fei Gua.
