Twins, Isabella and Arabella, are your every day, normal, 19 year-old girls. Graduating from high school, they plan to move forward and attend a university located in the busy city of Seoul, South Korea, but as they arrive, trouble begins to brew among them.
When the twins take a stroll in an unknown area that is strictly prohibited, they find a large rock with strange symbols engraved upon the front. Unbeknownst to them, though, the rock isn't what it seems. As they are transported onto a different planet, the girls learn that their whole lives have merely been a lie. Not every thing is what it seems, and as for the twelve boys they encounter along their journey, Isabella and Arabella will be faced with life threatening decisions as well as secrets.
Do Kyung Soo of the band EXO has fallen in love with a girl during his childhood. While growing up, his love for her grows more and more. But one day, when they are both all grown up, ready to face the world, Kyungsoo finds himself in trouble. Will he be able to find his love again? Will they be able to meet again? Most importantly, will he remember her?
Kyungsoo and his first love make a deal at the age of 5...something tears them apart during college. And death knocks on someone's door.