There Are No Bad Young Ladies in This WorldThere's No Such Thing as a Bad Lady; Noble Lady Reformation Guide / 세상에 나쁜 영애는 없다; Noble Lady Reformation Guide

Aristocratic young ladies are either rude and ill-mannered, or have nothing but flowers in their heads. Even in an era when talk like that was aplenty, there was someone who taught them. A commoner named Derrick realized he has talent for magic and made a name for himself as a mercenary. One day, he was invited to become the magic tutor for aristocratic young ladies. Thanks to Derrick, the star lecturer who turns those rude young ladies into a "proper person," prestigious noble houses start bombarding him with offers. “There’s no such thing as a bad young lady in the world.” At least, not in front of Derrick.