Haeseo Han is an ordinary, hard-working office worker whose main concerns revolve around being overlooked for promotions, smug colleagues, and workplace stress. That is, until she finds herself intertwined in a prophecy that will determine the fate of a fantasy world! In the realm of the Beiston Empire, Haeseo is seen as the oracle who will determine the next successor to the throne and bring peace to the country. Hoping to win Haeseo's favor and become the next emperor, the three charming yet eccentric princes of Beiston cross over into Haeseo's world to begin their lives together as housemates!