Although Qingzhou City had already disappeared, the history of Ye Futian's development could not be wiped away. In the Nine States, if one really wanted to investigate, they would be able to find out that he was born in Qingzhou City.
If it were just his place of birth, it wouldn't be worthy of suspicion. However, his growth, gifts, and the status that Yu Sheng had today, all of it pointed to an extraordinary background. Furthermore, when he was cultivating in the Nine States, there were details and hints that led others to speculate that he was related to Emperor Ye Qing.
Of course, this relation couldn't be proven because Qingzhou City had already vanished. Other than Yu Sheng, Jieyu, and his teacher Hua Fengliu, no one knew about his secrets.
As such, the most they could do was to speculate.
As for his true origin, it was even less likely that people would find out about it since he himself didn't even know.
Well then, who knew?