Su Nuannuan, the eldest daughter of the Su Group, accidentally transmigrates into the abandoned daughter of the prime minister in the Tian Ning Kingdom. She is sent to bring good fortune to the gravely ill Crown Prince, Dugu Haotian, and unexpectedly becomes his savior. As they spend time together, they fall for each other. But after suffering a blow to her confidence in the modern world, Su Nuannuan cannot bring herself to believe that true love exists, and tries every way she can to escape the palace. Living under an assumed name among the people, she cultivates flowers and researches new plant varieties, multiplying grain yields several times over. She becomes Tian Ning's greatest grain merchant and goes on to help the emperor resolve a border dispute with a neighboring country. Dugu Haotian searches frantically for Su Nuannuan and eventually finds her. At last, the two become a couple.
