She was his bodyguard, and he was the one who needed her protection. They disliked each other, but they couldn't separate because of that contract. He tried every means to torture her and taunt her in the hope that she would stay away from him, but she was an extremely stubborn person who valued her promise more important than her own life. No matter how humiliating or how great the danger, she never flinched and never left him. Finally, one day when she left him, he realized that she had entered his heart little by little and stayed there for a lifetime.
Purpose: Every life is worth cherishing, so no one has the right to give up easily.