Murong Yan was originally the princess of Weifu Kingdom, and her younger brother Murong Ziyu was weak and incompetent, so Murong Yan controlled the government. The two grew up together with their childhood sweetheart Zuo Xuer, and fell in love with her at the same time, but had no choice but to marry each other. In the process of getting along with Chu Linghan (pseudonym Chu Yu), a general from the enemy country who disguised himself as a man, Murong Yan actually fell in love with him. The enemy emperor Su Can of Bhutan also fell in love with Chu Linghan. After learning where the other person's heart belonged, he continued to go dark and provoked a war between the two countries.