Summons are what you call to those gods and goddesses and Summoners are what you call to those who have Summons. 16 years ago, a prediction was set on a girl saying she'll be blessed with a power to control all the Summons even if they have their own Summoners and thus, she will become the most powerful. Thus, Sandara Park of the Park Household is born, the Chosen One.

A prophecy is said to be done for her power to be complete. She have to marry her brother, Thunder, during the Walpurgis Night. Unfortunately for them, Dara never wanted to take part of this games, thus she run away and met Kim Jaejoong, an idol and the Venus's choosen Summoner.

At first, Jaejoong just got close to Dara out of curiosity about the Park Household and Summons. Yet, as time goes by, both fell into a love which is wrong and forbidden.

With the prophecy and the difference between their worlds, how would Jaejoong and Dara face the battles along the way?