
Spoiler..........
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This is the first time that the Prince saw Emiel.. Cause when he visited Estel in winter.. Emiel was not with her and was out for training...
He is suspicious of Emiel cause.:: the real identity of Emiel is... he is the son of one of the marquess.. Emiel looks exactly like his father (he only has a mustache)
It was mentioned it chapter 6 that the Duke is the only Duke in the empire..
And that he is so powerful and in order to match him, they need to combine the power of all the 4 marquesses...
I'm guessing that.. That the marquesses don't like the Castellio..
And the prince is suspicious cause why is a son of marquess (Emiel) working for a Castellio..
But I think Emiel is not in good terms with his father... I'm guessing that he ran away when he was a teen.. It was mentioned before that Emiel started to work for the Castellio when he was thirteen
Is the prince jealous and angry about the relationship between Estelle and her brother ?