Tang Zeyu traveled through time and became Tang Ye, the third son of King Ji, but he was actually the "abandoned son" exchanged by King Ji and his wife to protect their own children. He traveled through time at the age of six, and was imprisoned in Fangzhou Cicada Temple for more than ten years along with his father and his family, who were demoted to common people. During this period, he practiced the Qi training techniques taught by the generals of the Western Regions, and studied hard for five years to accumulate knowledge and lay a solid foundation for the counterattack. In her later years, the empress summoned King Ji's family back to Beijing. On the way, Tang Zeyu was abducted by Shuobei forces and promoted to the position of son of the Khan to fight against the imperial court. Instead of being manipulated by others, he turned into a secret agent of the court and used his wisdom to help stabilize the territory. After returning to the capital, Tang Zeyu, who has modern thinking, is at every step in the dangerous royal battle. He relied on ingenious plans to resolve crises one after another, gradually gained the trust of the empress, and was established as the emperor's grandson. He also successfully overthrew his biological parents who had no true feelings for him. Emotionally, he and the arrogant county prince Helan Raorao, who was in charge of the Xuannio Guard, had a mutual affection through hardships; he became his first wife with Xie Xiaoxie, a daughter of the Shuobei family; he rescued Xing Xunuo, who wanted to avenge his family, and gave birth to his eldest son. Tang Zeyu grew up from an abandoned son whose life was hanging by a thread to a calm and wise ruler, and finally ascended to the throne, determined to become an enhanced version of Li Longji and create a more ideal era.
