In order to solve the crisis in Donglin, Lan Ruoxi used her identity as a secret guard to rescue Rebu Fengxun, but because of this, she was regarded as a traitor by the prince of Nanyan, Rebu Hadi, waiting to be executed. Fortunately, the imperial physician was helpless against the poison in Rebu Fengxun, and Lan Ruoxi saved her life because of her superb medical skills. During the treatment, Rebu Hadi was gradually attracted by Lan Ruoxi's personality. At the same time, in order to rescue Lan Ruoxi, the Prince Qi Lingxiao of Donglin, and Gu Xifeng, a chivalrous doctor, sneaked into Nanyan. At Lan Ruoxi's insistence, Qi Lingxiao decides to accompany her to rescue Rebu Fengxun first, causing Rebu Hadi to be jealous. In order to launch her revenge, Princess Lousai joins forces with the Shadow Guards to provoke the relationship between Nanyan and Donglin, causing the war to break out. At a critical moment, with the help of Lan Ruoxi and Rebu Fengxun, Qi Lingxiao and Rebu Hadi finally abandoned their former hatred and turned into friends from enemies, joining hands to destroy Lousai's plan. In the end, Rebu Jado sacrificed himself for them....