Ding Wu came to know of this when the Emperor summoned him.
He merely nodded, almost expressionless.
The Emperor didn't bother much about it. To him, it was a good thing that his son seemed to be unaffected by it.
It was better to not needlessly react to something they couldn't do about.
Because of the Emperor's insistence at testing Mistress Luna's machine in front of the many Ministers, Generals, high-ranking soldiers and most of the Imperial family in attendance, it would be useless to try suppressing the discovery from getting spread.
Also, now that he knows that the Princess Consort was not actually related to the Song clan, he would no longer have to be so careful with her.
It was only because Master Sun was involved with the Song clan that the Emperor had to think twice about offending the Song clan.