Ninth Prince Zhu Mingxuan is framed by the Eighth Prince and exiled to Jiangxia. He kills a transmigrator who attempts to take over his body. Joining forces with his trusted confidant Lu Beiting, he dismantles the local powerful clans, distributes land, reduces taxes, opens granaries to stabilize grain prices, and recruits refugees into a new army. Using a system to obtain advanced military equipment, he foils several assassination attempts and military attacks by the Eighth Prince. Shen Yu travels to the capital to face political struggles at court, reopen an old case, and maneuver among the factions of the new emperor, the Crown Prince, and the Eighth Prince. He establishes secret networks across multiple regions to consolidate control of the south. After eliminating the Eighth Prince's remaining forces in the south, he wins the people's support through his achievements and is granted the title of Prince of Zhennan, taking charge of military, political, financial, and civil affairs across the four southern provinces.