For centuries, Julian lived with a rotting curse—immortality. Desperate to die, he discovers a prophecy about the legendary Astraea Sword, a blade capable of killing even an immortal. However, only the future Emperor can wield it. ​The sole heir, Prince Leo, is rumored to be weak, cowardly, and abandoned. To get close, Julian disguises himself as a woman named Bela and enters the palace as Leo’s personal maid. ​Julian’s plan is simple: nurture Leo until he becomes a tyrant powerful enough to end his life. But Julian doesn’t know two critical secrets: ​Leo is only pretending to be weak to keep "Bela" by his side forever. ​Leo is slowly falling in dark, obsessive love with his gentle maid. ​In a game of deceit, who is truly manipulating whom?