Years after losing his parents, Juhwan Kim has resigned himself to a life of loneliness. But on Christmas Eve, a mysterious man dressed as Santa grants his wish for a family of his own and transports him to another world. There, he finds an unlikely home with Lizzy, a traumatized widow, and her young stepdaughter. Determined to protect the family fate has given him, Juhwan must learn how to hunt, master his newfound magical powers, and survive in a world where kindness is a rare luxury.