Princess, Your Hero Is Actually Three Hundred Years Old

She came from a time travel and was born into a princess with boundless respect. Her father is the prince, her mother is the princess, and the emperor is her uncle... Her stunning appearance was ruined, she was a waste who couldn't cultivate, and she had the reputation of being a loser in cultivation... He is the most powerful top man on the continent. He is three hundred years old, has an eternal appearance, and has an artifact in his hand... When she met him, he said: "I am your ancestor!" How many unknown secrets are there?