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 feeling for the other it doesnt go the right way. Will they be able to fall in love with each other.