Modern youth Qin Yu time-travels to Great Wei, becoming the second young master of the Prince of Qin's Mansion, originally wanting to be an idle young noble. But the Qin family encounters suspicion from the imperial power, and he is forced to compose poems and offer strategies to resolve the family crisis. From then on, he bursts into the emperor's field of vision, gets to know the eldest princess Xiao Rou and sword immortal Shen Binglan, and becomes sworn brothers with crown prince Xiao Nan. He promotes movable type printing, improves papermaking, opposes the treacherous prime minister Fan Junliang, and amidst court intrigue and relaxed daily life, grows side by side with his partners, writing his own legend.