Exiled to a remote island, Su Wan is forced to separate from her elder half-sister, who despises poverty and loves wealth. She chooses to marry Lu Zheng, a poor naval officer. Using her special ability to sense things, she discovers seafood in the deep ocean and improves coarse salt to solve the military camp's difficulties. She predicts a typhoon and saves the entire unit of soldiers. Later, she processes and preserves seafood to establish a trading company, supplies medicinal herbs and kelp to the military, and earns the title of imperial merchant serving the royal household. Through her honesty and hard work, she builds a stable and prosperous life.