Hugyejaneun Moreugetgo Healing-ina Haryeomnida

Story

Start Your Survival-Style Healing Life! I quit my toxic job and logged into a game to relax only to find myself possessed by a character! But the character I’ve possessed isn’t even the game’s strongest mage, whom not even the emperor can mess with, but rather that mage’s frail eldest grandson, Leon Asteri? And to top it off, he’s a real headache who, even after suffering three mana shocks, still hasn’t awakened his mana. “At this rate, isn’t the little young master actually going to become the head of the family?” “Shh! Watch what you say!

Synopsis via AniList (English).