This is a world where each person gets a guardian/protector, there are different types of guardians/protectors, there are angels who are the "weakest" (so to speak), demons, forest spirits and dragons, each one can be in their human form or monster version. There is only one rule they cannot break: they cannot fall in love with their owners.

You thought he would be nice (he isn't) but you try to get along with him.

"I've already told you not to do that kind of nonsense, idiot! You could have gotten hurt worse!" he says in an angry and frustrated tone, while he heals the wound on your face with his powers, although you can notice that touch of concern in his voice