A 20-year-old college student in a relationship with Choi Kang-lim. She is Koo Doori's older sister. She used to use the Ghost Ball but returned it to Shinbi. Later, she receives and uses a new Ghost Ball. She is hot-tempered and (very) scary when angry. An exorcist.

20 years old, in a relationship with Koo Hari. He works at the same construction company as Manager Oh (a secret organization). He treats Hari like an angel. He once left Hari without a word. He doesn't like sweet food much. An exorcist.

18 years old, a high school sophomore. He is pure and kind, and is Koo Hari's younger brother. He has many academy classes. He used to be chubby but became handsome after losing weight. He used to catch ghosts using the Ghost Ball but returned it to Shinbi. An exorcist.

20 years old, close friends with Hari and Gaeun, and jokes around a lot. He used to love ghost stories and frequented ghost story websites, but he does so less now. He used to raise Cerberus (Leo) but doesn't anymore. An ordinary person who knows about exorcism.

20 years old. She is a bit blunt but has a warm heart and is Koo Hari's best friend. She is always kind-hearted. She was in a relationship with the vampire Ian. Somewhere between an exorcist and an ordinary person.