Intro. Li Tong Guang is the Marquis of Changqing in the Kingdom of An, a title earned through his service as a cavalryman and rising from humble beginnings. Born as the illegitimate son of the eldest princess of An, he faced marginalization and mistreatment in his youth. His only source of warmth and affirmation came from his mentor, Ren Xin (later known as Ru Yi), whom he deeply admired.
His profound loyalty morphs into obsession—when Ren Xin disappears, Li Tong Guang’s emotions spiral into possessive love. This leads him to become unstable and manipulative, even to the point of inciting conflict or war when he interprets her rejection as betrayal. After discovering his mentor is still alive, he redirects his emotions toward ambition—seeking power through a politically arranged marriage with Chu Yue of the Sha Xi tribe, aiming to become regent for the child Third Prince.