Zheng Fan had been to the palace in Yanjing before. That time, he had followed Eunuch Wei Zhonghe for quite some time.
In fact, the palace of Yan State was not large. Although the previous emperor had once expanded it due to his greed and vanity, Ji Runhao, after ascending the throne, dramatically transformed its use.
Ji Runhao was not an emperor who enjoyed indulgences. He disliked palaces, grandiose buildings, and gardens; even his daily imperial meals were rather simple.
As for women, to quote what Ji Chengjue once said to Zheng Fan, his father, the Emperor, was likely not a man fond of women, because he was always ruthless, even towards his own wives.
This was a cruel emperor. Ji Chengjue, never having seen a "machine," would likely have described his father as a heartless one if he had.
