Modern youth Gu Yan transmigrated to the Dayao Dynasty and became a notorious prodigal son in Yunzhou City. Everyone thought he was still that profligate spendthrift, but no one knew that this prodigal son had an entire modern world in his head. Starting from making ice and crafting soap, he step by step established his own business empire, opening hotpot restaurants, transforming brothels to host auctions, and burning glass to make a fortune.