In an ancient dynasty shrouded in mystery, imperial power is entangled with the interests of many factions.
The Prince of Zhenbei, a noble of a different surname, commands a powerful army and guards the frontier. His military achievements are unmatched, yet they also earn him the royal family's suspicion.
The prime minister holds great influence at court, and his daughter is both beautiful and talented. The crown prince wants to marry her to consolidate his power, but the prime minister refuses to let his daughter become a political sacrifice, so he arranges a ball-tossing contest to choose her husband.
Just then, Li Zheng transmigrates into the body of the foolish son of the Prince of Zhenbei.
At first, Li Zheng is bewildered and pretends to be a fool. Later, he reveals his true edge.
Drawing on the knowledge of later generations, he repeatedly plays the fool to catch his enemies off guard, showing off and delivering face-slapping comebacks.
He also puts modern, advanced military knowledge to use, defeating the Xiongnu and wiping out the Japanese pirates.
As he realizes his worth in life, he also wins the heart of a beautiful woman and finds a wonderful love.
