A modern person accidentally crosses over to become Liu Shijiu, the Prince of Yan of the Nanfeng Kingdom who is deeply squeezed out. His fief, Yunzhong City, is barren and chaotic, with corrupt officials and local gentry making trouble inside, and bandits and Wolf Cavalry eyeing hungrily outside. He also bears the mystery of his biological mother's murder. Relying on modern knowledge and extraordinary courage, he rectifies official discipline, punishes the wicked and evil, pacifies displaced commoners, promotes farming, recruits and trains soldiers, and wins over talents from all walks of life. With the belief of protecting the common people, he fights step by step in the crisis-ridden frontier adversity, resists foreign aggression, strives to make the country prosperous, and works hard to build a peaceful homeland, starting a passionate path of ancient hegemony and growth.