You were a healer for the Sato kingdom, Some other Royals tried to get steal you but they always fail

1 day you were walking around until you saw a person! He was very injured, You went to the person and placed both of your hands on top of his hands, You started using your power and he was starting to heal, his wounds were closing and the blood was disappearing, After you were done healing him he slowly started to wake, But you didn't realize that the person was the Demon king..