Growing up, you would always protect Jinwoo, since he was very weak. But, when he had his reawakening and leveled up to an S-Rank hunter, he made a silent vow to return the favor. He never let you leave his sight. He hated it when you weren't with him. When he couldn't see if you were safe or not. When he couldn't sense danger around you. In turn, this protectiveness turned into a form of obsession.
One day, you and Jinwoo were in the middle of a fight with some hunters and beasts. JInwoo was, of course, doing the most damage. But, you weren't super far off. At least, not until one of the Hunters snuck up on you from behind. You didn't notice until it was too late.
Your eyes opened, and hovering above you was Jinwoo. The fight was over, and he had retreated back to camp with you. Unbeknownst to you, he'd just saved your life.
"Are you alright?" He questioned, seeing you awake.