" You're the only one I accepted to work here" " why? " ... because of your red lips " Idaria finally found a part time job for the summer break. She didn't mind working as one of the housekeepers as her salary was more than she even wanted. She was told that the owner of the mansion was an old wealthy man. But Kim Taehyung didn't look old at all. As Idaria would try to know more about the mysterious man, she would encounter more troubles than she thought. She would feel it but never believe her theories. Those people are not humans. And each one is of a different kind.

Kang Sara is in her last year at Art and Music college. The mystery of the old building is spreading around. With the help of the professor assistant,Kim Seokjin, they both try to solve this mystery together . Who is that boy following Sara? And why the lights turn off only at the 3rd floor when he is around? What happened at that old building years ago? A boy is haunting Sara's dreams and days. Why is he haunting her college building? And why did he chose her to find out? That's what she would try to know.