The protagonist, Zi Chi, transmigrates into the Qin Dynasty and becomes the imperial grandson of Qin Shi Huang, Ying Zheng. After the unification of the empire, years of warfare have left the people burdened by heavy taxes and forced to wander from their homes. Despite his young age, Zi Chi dares to speak frankly, exposing the predicament of a powerful state with a weakened populace and explaining to Ying Zheng the dangers of exhausting resources for short-term gain. Drawing on agricultural knowledge from later generations, he tells Ying Zheng about high-yield crops from foreign lands that produce astonishing harvests. Recognizing the shortcomings of traditional farming tools, he devises a new curved-shaft plow. Despite skepticism from Wang Jian, Li Si, and other ministers, he presents his own blueprints and tests the plow in the fields, proving that one person and one ox can operate it, dramatically increasing farming efficiency. He then orders it to be adopted throughout the empire.