Ling Yao, the foremost merchant in the realm, is framed by his uncle and the prime minister and loses his memory. He wanders among ordinary people and is rescued by Lin Wange, the owner of a rouge shop. He stays by her side pretending to be mentally impaired while secretly protecting his wife. Once his memories return, he makes a powerful comeback to the Ding Shang Marquis's residence. He exposes the forged dragon tally, resolves the salt shortage, settles the crisis at the money houses, and foils a palace coup. Along the way, he settles accounts with his enemies and revives the merchant network. In the end, he ascends to the throne as Duke Dingguo, takes control of the commercial and political affairs of the Great Yong, and joins his wife in safeguarding an age of prosperity.