Young Zhu Yunwen was pushed to the throne after his grandfather Zhu Yuanzhang died suddenly. Facing the huge empire and his uncles who were eyeing the vassal king, he was full of uneasiness and fear. With the assistance of Qi Tai, Huang Zicheng and other ministers, Emperor Jianwen began to implement the policy of reducing vassal states, aiming to weaken the power of vassal kings in various places. However, it aroused strong resistance from the vassal group headed by King Zhu Di of Yan. The King of Yan, Zhu Di, launched the Jingnan Campaign in the name of "Qingjun Side". Emperor Jianwen suffered military defeats and had to face the serious consequences of his wrong decisions. As the Yan army approaches Nanjing, Emperor Jianwen faces a difficult choice - fight to the death or flee secretly. This decision will affect the fate of the entire empire.