Betrayed by his girlfriend, Chen Yu accidentally activates an ancestral ring, enabling him to shuttle between modern times and the ancient Dayong Dynasty. He arrives at the fief of Eldest Princess Su Wanxing, which suffers from famine and war, transports food, medicine, and engineering machinery back and forth across the two realms, provides disaster relief and epidemic prevention, builds cities and engages in infrastructure, uses the inter-communication of goods between the two realms to accumulate huge wealth, fights against unscrupulous merchants and barbarian invasions, joins hands with Su Wanxing to build the fief, and at the same time connects with the modern state, uncovering the secret of the spiritual energy world of the Dayong Dynasty.