A virus has decimated humankind. Those who survived emerged blind. Centuries later when twins are born with the mythic ability to see, their father must protect his tribe against a threatened queen.

The story revolves around an Emperor who does not know martial arts and an Empress who is skilled in swords fighting. They dislike each other and do not get along. One day, they find out that their souls have switched. Left with no choice but to live with the other's identity, they slowly unravel their misunderstandings and learn to love and trust each other.