He was always the perfect model of a son: Obeyed his parents, is gentle, hard-working... The perfect son. He was always showing he was capable to do everything properlly, and he is really kind and lovely with his parents and siblings. He didn't have much of a exciting life, because, without notice, he had put so much effort into being perfect, he forgot to live his life as his own. Suho was only going to SM's Castle because of one of his siblings, who did something that their parents can't accept (you invent this part). But Suho didn't want to go to SM's Castle. At the begining, he didn't seem to be worried or irritated with this, until something bothered him. That thing (you have to criate it too haha) made him show his real feelings, including the fact that he blamed his sibling for being in the castle.