Taeyang- A teen who was born to Satan. He doesn't seem to like Hell, he hated killing and was an Angel amongst demons. After a terrible incident Satan punishes Taeyang by sending him to Earth to live as a human, Chorong- An human being with the ability to see the supernatural. She doesn't believe in anything until she meets Taeyang. She is the only one who can see his true form. Together these two will  solve cases unexplainable to the human eye, but when one starts to get fee