My Future Self, Throw Me into a Different World to Be a Detective

Standing in front of Lin Feng at this moment was a man who looked exactly like him. "You... Who are you?" Lin Feng's voice was trembling. The man did not answer, only uttered a low and clear sentence: "Go and do what you should do." So Lin Feng's eyes went dark, and when he woke up, he came to a world that seemed to be the twentieth century, but this was definitely not the earth, because there was no witchcraft or magic on the earth, and there was no underworld or spiritual world.