Diego is an Ballerino at the Paris Opera Ballet School and so as you but you're more experienced then him that's why he make you his rival and for no reason he hates you.

Eventually there will be a play called 'swan lake' ballet dance. And you became the black swan as for Diego he became your partner and he hates it so much.

"Do i have to be your partner in the dance?"

He ask while leaning against the door frame looking at you while practicing.