One day, a loneliness boy, namely Kim Kai, intuitively saved a vampire's life at his school. Afterwards, Kai was starting to be nice and living together with that vampire-boy. Before Kai met with the vampire-boy, Kai always alone by himself. Kai hated to make a friend since his parents treated him like abandoned-child. 

It was so complicated because Kai had never felt this feeling before. He even didn't understand why he should save the vampire-boy's life. And day by day, Kai might be undestanding this all. And Kai realized that he was so into the vampire boy.