I can say that Ako is pure fabrication. Many stories about Wu Sangui and Li Zicheng in Chen Yuanyuan are fabricated, and so are their children.

It is worth mentioning that Wu's songs, a famous poet in the late Ming and early Qing Dynasties, were quoted, which truly achieved history and quotation, and increased the vividness and historicity of Chen Yuanyuan's plot.

The Duke Of Mount Deer is indeed a good book worth reading and reading many times (not to mention the reason).