Story about a 21 year old woman who was kidnapped when she was 17 years old by American scientists. In this world there are 3 species of Demons, S.1; S.2 and S.3. She is eventually saved by a South Korean military team who bring her back to their country. There, she is kept under watch so that she doesn't fall into the wrong hands (again). She tries to adjust to the world, learns to control her thirst for blood and finds out where she belongs in the world.