He was the Son of Hades and Persephone while you were the daughter of Aphrodite and Ares. Which makes him the Prince of the underworld.

The both of you went to God school, and were rivals. He was a cold person and you were pretty bright and was the one to be chased too.

He didn't like that your mother was a flirt and thought you were the type to be like that, until one day you visited the underworld for a school project and surprised to see his cerberus loves you.