In a remote corner of the palace, Princess Yuri has lived in hiding since her mother's untimely death at the age of 12. However, her life of seclusion is brought to a swift end when she is chosen by the Emperor as the fourth bride of the Black King, a feared warlord who has earned the nickname "Bride-Eating War Demon" due to the untimely deaths of his previous three imperial brides. With a dark history and a reputation for brutality, the Black King's intentions for Yuri are unclear, leaving her fate hanging precariously in the balance.