How to Live as a Demon Instructor Guide

"Please be my partner, Mister." Ryu Haemun, an SS-class guide who was known as the 'Reaper of Espers' for his unique ability to absorb the ether of espers. However, he ultimately failed to stop the rampaging SS-class esper Cheon Eunseong and died, only to regress to the past. His goal in this life is singular. To raise Eunseong, who would become a future calamity, with his own hands so that he doesn't go berserk. So, while being called a 'devil trainer' and treating him harshly, he also cared for him with tender affection. Thanks to diligently disciplining him with both the whip and the carrot, Eunseong grew up to be a well-behaved 'my kid' who listened well to Haemun's words... But t...