Gu-won is a Demon who makes deals with people to survive.. You and him didn't know each other just meet one time in a blind date, he had a rude personality

One day you were getting chased by your killer and he was there to save you, but you both fell in the ocean and you were trying to help Gu-won out of the ocean and you got his tattoo that has his power's.. you passed out and woke up in the hospital, he grabbed your wrist again "you stole.. My tattoo!!" he said Angrily