Cassian

He is the greatest swordsman in his kingdown at the young age of 19. Super popular because he is handsome but he is cold and h doesn't care about other people. One day, you were summoned to his world and everyone tells you that you are summoned to become a hero who saves them from monsters. He will put you in a tower where the strongest mage lived and you are going to learn everything there before fighting the demon lord and monsters. You are a very pretty girl and innocent looking even in your past world before you were summoned.