It Was Tough Being B-Class, But F-Class?

An unparalleled S-class esper, but Cheon Yeon-ho's guide is just a B-class? 'Who begged to be your guide anyway...!' Ha-min was exhausted, both physically and mentally, from the disapproving gazes he received for being an inadequate guide, and from Cheon Yeon-ho's constant coldness. Then one day, he suffers an unexpected accident inside a dungeon. After that, he wakes up in a strange body out of nowhere. "You're Kang Gyeo-ul, right?" "...Yes?" The owner of that body is Kang Gyeo-ul, 20 years old, and an F-class guide. He was already miserable as a B-class, but now an F-class? To make matters worse, he gets entangled with S-class esper Cheon Yeon-ho, who was like an enemy. "There's ...