Park Sooyun, a beautiful girl and really likes fashion. Being a famous fashion designer and creating her own brand is her dream to achieve.  A very hardworking girl and very pleased by everyone. One day, her life turn upside down when she accidentally saw her senior killed people at her university.

Jaebum.  Also known as JB, a senior to Sooyun. Taking a science stream. He is one of the most famous group in the university, Got7. Everyone in the university envy him. Boy neither girls. They envy his cleverness. But one thing people doesn't know about him and his group is they are vampires. Searching for their prey. But one thing Jb didn't know is that Sooyun is his mate. Not only his.

Mark Tuan, familiar with Mark. A very hot temper guy around people, but not s. Taking sports as his stream and very successfull in it. He is very rough and mean person between s and will kill his preys after he their blood.