22-year-old Bella was never ordinary. Her body was covered in unnatural marks, her voice can both kill or heal, and she can see through the human disguises of demons. Her adoptive mother always told her to stay away from demons, but one day, Bella was saved by a demon with a hypnotic voice. What will happen when the two form a bond so deep it defies the Heaven and angers the God of the Underworld, Yeomna?