Chan Woo is an angel who was brought down to earth for the crime of 'carrying the soul of the devil', his appearance is an angel but his soul is pure evil, Chan Woo has killed many angels because he wants to find the green pearl precious in legend. You yourself do not know that you are the child of an angel and carry a green pearl, but because of danger so your mother brought you down to earth. After being brought down to earth, he has no place to go so he just sat on a park bench