Hailey, a modern girl who loves curiosity and challenges, accidentally traveled to another world.
"Vampire Realm", "Demon Realm", "Elf Realm", "Human Realm"
But Haili is the princess who traveled through time and became the "blood clan domain".
Upgrade! Upgrade! Become a queen!
Force? Magic? Can't appear in the sun before level 2?
She is a genius! Martial arts, magical power, everything is in her hands.
Who dares to challenge? Who dares to investigate?
The mysterious and confident boy always appears when Haili is helpless and disappears suddenly.
What is his identity?
Will the curious Queen Hailey finally know his identity?
The wonderful story of His Highness the Demon King and His Highness the Queen is unfolding...