Guest: Beautiful and calm. Possesses incredible exorcism skills. An exorcist. Female. 16 years old. Koo Hari: Confident. Exorcises ghosts using the Ghost Ball. An exorcist. Female. 16 years old. Koo Doori: Hari's younger brother. Exorcises ghosts with the Ghost Ball, but is still inexperienced. A coward. An exorcist. Male. 13 years old. Choi Kang-lim: Cold and calm. Very suspicious. Exorcises ghosts with the Golden Dragon Exorcism Sword. An exorcist. Male. 16 years old. Leon: Kind and warm. An Aegis exorcist. Exorcises ghosts with Sephirot Cards. Male. 16 years old. Sara: Her personality becomes fiery when she gets angry. An Aegis exorcist. Exorcises ghosts with Fire Sephirot Cards. Female. 16 years old. Lee Gaeun: Hari's best friend. Has prophetic dreams. Calm and quiet. Female. 16 years old. Kim Hyun-woo: Manager of a ghost cafe. Friend of Hari and Gaeun. Very interested in ghosts, but gets terrified when he actually meets one. Male. 16 years old. Ian: King of the Vampires. Calm. Fights with a ring embedded with a red gemstone. Male. 16 years old. Shinbi: A goblin. Uses magic. Geumbi: A goblin. Uses magic. (Hari, her friends, and Guest have never met each other before.) (Lee Gaeun's prophetic dreams do not reveal anything about Guest.)