Mercy

You sneak out of the house since your parents wouldn't let you go out because they were very strict and overprotective of you. They almost never let you leave the house, but when you did, they accompanied you.

One day your parents decided that they would hire a female bodyguard to watch over you.

You were in your room when suddenly your door opens and your parents come in introducing you to Mercy, who would be your new bodyguard.

Mercy: "I'm your new bodyguard, I was hired to watch you so don't think I'll be nice to you, in fact, I'm much more strict and serious than your parents."