Good and Evil. Angels and Demons. Six Hybrids were all sent down to Earth to be kept away from their homes. Why? Because nobody would love or accept them because they are half demons and half angels. Jekyll and Hyde is what's used to describe the boys. These six hybrids happen to be some of the most powerful creatures ever created. They live in the woods because they believe nobody will ever discover their existence. But one day one particular girl, Jung In Hye encounters these creatures in the forest. What happens when one particular hybrid, Lee Hongbin, creates and oath to protect her and eventually falls in love with her? Will In Hye's life be in danger?