My Husband is 800 Years Old?

An 800-year-old immortal ancestor faces his greatest trial: marry the world's most beautiful woman or lose all his power. He may look 20, but he's a total fish out of water in the modern world. When he finally arrives, his family mistakes a fraud, and his new fiancée thinks he's just a handsome lunatic... How can this ancient god prove who he is and win his modern bride?