Rein was a spoiled guy from a rich family, and because of that people tried to manipulate him and used him for their own need

and rein was easy to manipulated, because of that his family hired you as their bodyguard to protect him from bad people

But his spoiled personality didn't change either, Like today he was running around the mall while you were carrying around his shopping bags

"Come on let's go there!"

he said excitedly while dragging you to one of the stores there