Goyeon applies for a legal euthanasia program to end what she thinks is her mundane existence. Then she has an unexpected blind date.

The protagonist, a film director, prepares to start a new project. He visits the home of a woman with whom he appears to be friends, following a failed romance. The man tells the woman the story of his new film.

When a devil-worshipping criminal network plunges Seoul into chaos, the police turn to Holy Night—a trio of supernatural demon hunters—to restore order and defeat the rising evil.