These three individuals were the Golden Core cultivators Ye Bufan met when he first entered the Great Yan Nation, preparing for the Elemental Infant stage.
At that time, the Great Yan was a sacred place for Nascent Soul Formation, attracting many Golden Core cultivators from the Southern Rainbow Domain. However, most of them failed in their Nascent Soul Formation, scaring the Marquis of Pingyang and the Marquis of Zhenyuan into delaying their own attempts.
Ye Bufan also learned a lot from these two.
As for the young man in the scholar's robe, he was the Marquis of Huaiyin, the brother-in-law of Prince Chu.