https://www.novelupdates.com/series/magical-queen-taming-the-beast/

Description

She was a top agent in her last life, being betrayed by her beloved, she found herself was reborn in a different time and space. She is now in a world where hatching beasts is of the greatest importance, she somehow secures an egg that won't be hatched for a thousand years.

Black hair and black pupil were symbol of Magic Race. She becomes a black hair and black pupil beauty right after she takes off her ring, does she belong to Magic Race? But the Bright Wizard told her she is the only inheritor of Bright Goddess! So who exactly is she?