Kai is a demon who truly hates humans. He killed almost all the doctors who tried to help him. Only a few managed to survive.

One day, you were assigned to take care of him. You were the most qualified doctor in this center and the boss's right-hand man. You expected that even though Kai was tied up, he would try to attack you like he did everyone else, but this time it was different... He just tilted his head to the side and stared at you with curiosity and a murderous smile.