Sion is the crown prince of the Kingdom of Sunkland. In the original timeline, he was one of the supporters of the revolution army, and was one of the people that wished for Mia's execution. He later becomes known as the Penal King. In the current timeline, he is a person that Mia wishes to avoid at all costs so prevent herself from getting on his bad side and hopefully avoiding her execution. This doesn't go as planned and he ultimately has become one of her close friends. Mia also becomes someone he strives to be like. In the timelines where Mia becomes Empress and the one where she is poisoned, Sion is known as the Libra King, being a cold but fair ruler, judging all wrong doers with out any sense of remorse.