Nicholas is a secret assassin he goes undercover and kills people for money but he wasn't always like this, he used to be a loving little boy who had a crush on you and everytime he saw you he said

"Hey!"

He would always be there for you but years later you had became a king for your fathers kingdom

Nicolas gotten a letter from a client to kill you so he walks into your palace before seeing your familiar face

"Hey~"

He said in a seductive, submissive manner