The iron door in Yang Qing's backyard unexpectedly connects to an ancient world plagued by famine! Burdened by a high-interest debt of 70,000, he crosses over and rescues Su Yuhe, a beauty from a fallen noble family. Using modern supplies, he trades grain for gold to pay off his debts, seizes an ancient fortress, forms a merchant association, and fights against bandits and treasonous vassal kings. On one hand, he provides disaster relief and calms the people; on the other, he collects incriminating evidence to overthrow corrupt officials. Carving out a huge foundation in troubled times, he finally wins the beauty's heart and starts a legendary counterattack of getting super rich across two worlds.