In order to resolve the crisis in Donglin, Lan Ruoxi rescued Rebu Fengxun as a secret guard, but was regarded as a traitor by Rebu Hadi, the prince of Nanyan, and was waiting to be executed. Fortunately, the imperial physician was helpless against the poison that Rebu Fengxun had been poisoned with, and Lan Ruoxi saved his life because of his superb medical skills. During the treatment, Rebu Hadi was gradually attracted by Lan Ruoxi's personality. At the same time, in order to save Lan Ruoxi, the prince of Donglin, Qi Lingxiao, disguised himself as the chivalrous doctor Gu Xifeng and sneaked into Nanyan. At Lan Ruoxi's insistence, Qi Lingxiao decided to accompany her to wake up Rebu Fengxun first, and because of this, he became jealous of Rebu Hadi and launched a series of pursuits. In order to avenge her hatred, Princess Qingcheng of Lousai teamed up with the Shadow Guard Group to secretly manipulate the relationship between Nanyan and Donglin, causing a war to be triggered. At the critical moment, with the help of Lan Ruoxi and Rebu Fengxun, Qi Lingxiao and Rebu Hadi finally put aside their past grudges and became friends. They joined forces to destroy Lou Sai's plan. In the end, Rebu Hadi sacrificed himself to fulfill their relationship.