What If the Crown Prince of Chongzhen Survived During the Ming Dynasty?

(No time travel + history + late Ming Dynasty + no heroine + no secret powers + salvation) March 19, 1644 Li Zicheng hanged himself in Meishan Prince Zhu Cihong was captured Later, he disappeared after the Battle of Shanhaiguan, starting a series of battles in the Southern Ming Dynasty. If Zhu Cixiang could survive, could he continue to serve the Ming Dynasty for another three hundred years...