Hundred years ago, there's a planet of vampires called EXO.

But as these 12 boys have just violated the rules of planet EXO to not eat any of the fruits from the Soul Tree, a tree that holds all the soul of the deads, they were sent down to the Earth as their punishment.

As they went down to Earth, they were separated into two.

They took their own path and as they live on Earth, they found themselves falling for the humans on Earth and the warmth on Earth.

   But everything will not be happy forever. What if one of them changes and become a bad vampire? Who will the girl named Lee Yoon Mi chooses when she is torn between clan M and clan K? What will happen if the 12 boys fell in love with a human girl?