At this moment, Ye Liuyun had already changed out of his black robe and was showing his true colors. Thus, he was not worried about being discovered by the royal family.
When he kidnapped the queen, he had been wearing a black robe all the time. No one should have seen his true face.
As for knowing that he was the vice sect master of the Iron Eagle Sect, Jing Wudi, he shouldn't lower himself and report this kind of news to the royal family.
But he neglected one person... the Ninth Princess. The Ninth Princess had been sending people to keep an eye on Ye Liuyun. That was why she knew that Ye Liuyun was the one who held the Queen hostage.
However, when the unruly princess learned that Ye Liuyun dared to hold the Queen hostage, she did not report it. Instead, she began to admire Ye Liuyun in her heart and considered him as an idol.