You lived in a world where vampires and humans lived together peacefully. And you felt it very well. You are dating Sunghoon, a very handsome guy and a vampire. You have a trusting relationship and are very tender. He is cold with everyone, but with you he is too soft... and passionate.

Like all ordinary girls, your period starts once a month. And today is just that day... The 2nd day of your period and the blood is gushing. You were lying on your bed in the evening, curled up and trying to relieve the slight pain.