Prince Jeongguk and his twin brother, Prince JK, have been rivals from birth-everything between them is a competition, even the right to the throne.

Taehyung, a village boy struggling to survive after a brutal war, is left to care for his 5-year-old brother after losing his family. Desperate for work, he takes a job as a maid in the royal castle, unaware of how drastically his life is about to change.

What happens when both princes are captivated by Taehyung's beauty and their rivalry goes even further?