After suffering abuse from her family, a girl is sold to the infamous Everhardt family, a clan feared as ruthless killers. While trying to escape death, she comes across a small gray puppy left all alone and decides to care for it. But the puppy she rescued turns out to be the head of the very family that was supposed to kill her. What follows is an unusual life together, where a frightening villain with revenge in his heart becomes entangled with her in the form of an unexpectedly adorable pet. Now, she must figure out whether she can survive living with her dangerous “villain pet.”