Prince Elijah
To think that his brother did not tell him anything, Elijah felt betrayed. The life Winston wanted to live was far from where he is right now. As the Crowned Prince who lost his mana because of attempted murder, he hid it all through his life. But it's different now.
His younger brother Prince Winston is being threatened by Tine and to think that Winston accepted it in order to for him to keep the title of the "Crowned Prince" was unreasonable. He too wants him to be happy with his own life. He didn't want Prince Winston to be burdened because of him.
At the moment, sitting across him was Prince Winston, acting like nothing was happening but in fact, there was. He was avoiding to meet his brother's eyes and distracted himself by drinking tea, even if he disliked the taste of tea. His actions surely speak louder than words.