Byun Family:
The Byun family is well known for the Byun Real Estate Business. They spent 5 years in the states before moving back to Seoul so they can work on the family business.

Byun Jun-Hyun: The owner/CEO of the Byun Real Estate Business. Head of the Byun family. Father to Baekhyun and Lilica, and husband to Baekhee.

Jin Baekhee: Jun-Hyun's wife/business partner and mother to Baekhyun and Lilica.

Byun Baekhyun: Heir to the Byun Real Estate Business and college student at Yonsei University, majoring in real estate and minoring in business. He knows of the Park family and their secret life, and that his younger sister, Lilica is in love with their heir, Chanyeol. Baekhyun hides it so they aren't in danger.

Lilica Junhee Byun: The youngest member of the Byun family. She is currently a student at Hansung High School, beginning her senior year. Since she isn't going to own the family business, she hopes to go to college and study to own her own interior design business. She's close to her older brother, Baekhyun. Lilica was in love with Sehun, her boyfriend of two years, until he leaves her for Sumi, her cousin who also attends Hansung. In the night of what was suppose to be their 2nd year anniversary, Lilica runs to the forest and gets chased by vicious werewolves. She's saved by a vampire named Chanyeol, and slowly falls in love with him.

Park Family:
The Park family is wealthy for their medical research business and the hospitals they own in South Korea. They do this not only to mask their lives as vampire, but to also feed off of the blood supply from their patients and research animals.

Park Chansoo: Head of the Park family and CEO of their medical research business. He manages to get the right amount of blood supply through his business to feed his family, and use the rest to treat his patients. Chansoo tries to set his son up with Irene Joo-Hyun Bae, heiress of her family's zoology research business, who also happens to be vampires. He does this so their business can grow, as well as the vampire bloodline. Chansoo has shapeshifting powers.

Lee Yeongmi: Chansoo's wife and mother of Chanyeol and Yoora. She is more calm and collected, and hopes that humans and vampires can get along with each other and live peacefully. Unlike Chansoo, Yeongmi wants her son to fall in love and find his mate, even if his mate is human. She helps Chanyeol enroll into Hansung High School after 5 years of being homeschooled, and, with Yoora, keeps his love for Lilica a secret. Yeongmi has the power to inflict pain onto others by using her mind.

Park Yoora: Heiress of the medical research business, Yoora is working as a doctor. Like her family and fiance, she is a vampire. Yoora cares about others and hopes humans and vampires can live together in peace. She knows her younger brother, Chanyeol, is in love with a human. Yoora secretly encourages their relationship, and hopes she and her mother can convince her father to not let Chanyeol marry Irene. She has healing powers that allow her to heal using her fangs, mind, and hands.

Park Chanyeol: Youngest Park family member, arranged to marry another vampire family business heiress, Irene Bae. However, he wants to find his mate naturally, and doesn't want to marry Irene. He also doesn't want to work for his father's business, but want to own his own construction business. When he runs away from home to find his long lost love, Chanyeol saves and meets Lilica. As soon as his eyes met hers, Chanyeol falls in love with her. He does everything he can to protect Lilica, and create a life they both want. Chanyeol has fire manipulation powers, which helps him become immune to fire and sunlight.

Bae Family:
The Bae family does zoology research and owns a zoo in Seoul. They are partners with the Park family, and Irene is set in an arranged marriage to Chanyeol, much to his dismay. Like the Park family, the Bae family members are vampires.

Bae Do-Hyun: Zoologist and owner of the zoology research business. He is head of the Bae family, and good friends with Chansoo. Do-Hyun has the power to speak to animals and command them.

Kim Eunbi: Wife of Do-Hyun, and mother of Irene and Iris. Her powers allow her to sees someone's past and predict their future, even people she doesn't know very well. Eunbi can also enhance or erase parts or all of someone's memory.

Irene Joo-Hyun Bae: Heiress of her family's zoology research business, and in love with Chanyeol. Irene attends school with him and Lilica, and went to the same school she did in the states for five years. When she finds out that Lilica is falling in love with Chanyeol, and that Chanyeol loves Lilica, Irene is out to kill her. Her powers allow her to be invisible to the naked eye.

Iris Eun-Hyun Bae: Youngest member of the Bae family, and first year middle school student at Hansung middle school. Iris is caring, gentle, and wants to get along with the human race. She tries to stop her sister from hurting Lilica, and knows that Chanyeol doesn't love her. She secretly encourages Lilica and Chanyeol's relationship. As a vampire, Iris can sense when and whom with a vampire fall in love. She has two kinds of powers: enhanced vision and destruction powers, allowing her to destroy whatever she sees, hears, thinks about, or touches.

Other Characters:

Kim Dahyun: Lilica's best friend and classmate at Hansung University. She is very optimistic and encouraging, and hopes Lilica and Chanyeol end up together.

Oh Sehun: Lilica's boyfriend of two years, but he secretly also dated her cousin for two months. After he dumped Lilica, Sehun dates Sumi, but sometime soon, regrets this, and dumps Sumi so he can get Lilica back. He gets jealous of Chanyeol when he finds out him and Lilica are secretly dating.

Min Sumi: Lilica's cousin Sehun cheats on her with. Sumi is madly in love with Sehun, but is upset because she found out Sehun was dating Lilica before her, and that he left her so he can rekindle things with Lilica. Sumi tries to win back Sehun's heart, but blames her cousin for ruining her chances with him.

Kim Jongdae: One of Chanyeol's friends at Hansung High School.

Kim Jongin: Another one of Chanyeol's friends at Hansung High School.

Choi Min-Ah: Baekhyun's girlfriend.

Im Tae-Ho: Yoora's fiance who works with her as a doctor. Also a vampire. He has the power to move things with his mind, and control other with his mind as well.

Xi Luhan: Sehun's best friend.

Mrs. Kang: Lilica's homeroom teacher.