Grain Merchant in a Chaotic Age

He transmigrated into the body of a spineless concubine-born son of a grain merchant. The moment he opened his eyes, he found someone had tampered with the accounts, and he had a lump on the back of his head. Everyone thought this illegitimate son would be easy to bully. No one knew he had spent his whole life calculating accounts, and the kind that could cost you your life. An age of chaos was coming, and grain was more useful than a blade.