Li Yi time-travels to become the prodigal second young master of the Zhenbei Marquis Manor in Da Zhou. As soon as he wakes up, he owes a massive debt of three thousand taels, and the marquis manor is about to be seized by Wang Zhiwei. At a critical moment, he binds the "Pinduoduo System", uses a five-yuan coupon to buy a lighter, shocks the Chang'an nobility with modern goods, and successfully reverses the tide. From a destitute good-for-nothing hounded by debts to a governance genius in the eyes of Emperor Wu, Li Yi relies on modern thinking to turn the tables all the way. For disaster relief, he proposed work-relief; for road building, he designed tolls to repay loans; in business, relying on the modern mall to stir the imperial court and become the richest in the world, he also led the entire Da Zhou Empire toward an unprecedented new era.