Emergency room nurse Noah takes in the mysterious Vivian as a roommate, only to discover that she is a vampire princess framed by the royal family—and that he himself is the descendant of a guardian, the only one who can resist her hypnotic power and counterbalance the influence of the vampire crown. As they live together, deep affection grows between them, but they are soon drawn into the schemes of Vivian's aunt, Isolde, who is plotting to seize the throne. Faced with relentless assassins and the crown's terrifying power to control minds, they join forces to expose a century-old royal conspiracy. In the end, they both renounce their inherited special abilities, cast aside their identities as princess and guardian, and choose to spend the rest of their lives together as ordinary lovers and simple roommates.
