Bookstore Owner's Commission Reasoning

A northern city, an old era that does not belong to him. Xu Ming'an thought he would live in the original world, but he didn't expect to come to a world he had never heard of. In order to survive, he completed a transaction, a contract, and obtained a book in his dream. After uncovering cases again and again, he discovered the dark side of the world, and he was at the center of it.