Not only was his tone neutral, but his conduct was neutral as well, making it impossible for Rui to gauge his emotions.
And yet, it was his word choice that betrayed him.
Since the war, his Master epithet of Dawnbringer had become radically more popular than the epithet that he had gained after his identity as the royal prince of the Kandrian Empire had been revealed.
This was especially true after he had begun traveling around the world as one of the pillars of hope in the Era of Darkness.
And yet, despite that, the official envoy sent to welcome and guide addressed him with the epithet of Void Prince rather than Dawnbringer.
That little clue alone allowed Rui's sharp mind to derive an endless number of inferences about the stance of the Royal Sol Family regarding him. The fact that he didn't so much as acknowledge Amare irritated Rui, but more importantly also told him about their stance regarding her.