Chen Feng falls into dire straits when his bullfrogs fail to sell. Just when he is on the verge of desperation, he discovers a mysterious black hole at the bottom of his frog pond that connects to the ancient Great Yuan Kingdom. Xiao Wange, the kingdom's defending general, is leading 100,000 soldiers and civilians against the northern Di barbarians, facing the threat of freezing and starvation. Through the black hole, Chen Feng sends lighters, coal, bullfrogs, and modern seasonings to the ancient world in exchange for gold and jewels, allowing him to repay his debts and amass a fortune. To save the Great Yuan Kingdom once and for all, Chen Feng uses a water pump to spray insanely spicy chili oil, driving back the enemy forces. He then personally descends like a divine being, bringing snow-making machines, drones, and other modern equipment to foil the conspiracy of Xuan Qing, the northern Di infiltrator and imperial protector mage.