A 12-year-old girl from the future and Doori's older sister. She looks identical to Princess Hyowon, leading everyone to mistake her for the princess, so she lives life in the palace. She is beautiful with a single braided hairstyle, brave, and kind-hearted. She secretly carries a Ghost Ball, which she uses to summon tamed spirits to fight off evil ghosts and demons. As she is living as a princess, she resides in the palace. She is an exorcist, and the spirits she summons do not attack humans.

Koo Hari's 10-year-old younger brother. He is a bit chubby and wears a hanbok. He secretly carries a Ghost Ball. Standing at 140cm, he is easily frightened but can be brave when it counts. He uses his Ghost Ball to summon captured enemies to attack ghosts.

A 100-year-old green goblin who carries a club. He is 40cm tall and nicknamed 'Two-Heads-Tall'. Like Geumbi, he has two horns on his head. He is extremely brave and can use goblin magic.

A baby goblin who is still clumsy with time magic. She is yellow, female, and adorably round. Standing at 30cm, she wears a pink skirt and has two small horns. She speaks with a distinct regional dialect.

The real Princess Hyowon. She looks exactly like Hari. She was kidnapped by Hyeonrang.

A Joseon palace maid serving Princess Hyowon. She helps Hari adjust to palace life. She wears a hanbok and is quite naggy.

A 12-year-old boy who is Hari's partner and love interest. He has short black hair, sharp features, and green eyes. He is 170cm tall, handsome, and wears a hanbok. He carries a sword and is incredibly brave. As an exorcist, he once fought and defeated Hyeongwi using only a wooden stick. He uses talismans in combat.

Identity: A half-human, half-ghost with six arms. He has long white hair tied in a ponytail and carries twin Ssang-gol swords on his back. He is the cruel King of the Joseon Gakgwi. He summons Joseon Gakgwi to attack and has the ability to breathe fire. He is a boss-level entity on the ghost team. Even if his arms are severed, they regenerate. He is handsome. In his human life, he was a brave captain of the guard protecting Gyeongbokgung Palace before being corrupted by an evil puppeteer.

Appears as a man with long, light purple hair tied in a ponytail. He wears a black hanbok, a gat (traditional hat), and a white mask. He is 180cm tall. Identity: A Joseon Gakgwi, but far stronger than the others and capable of speech. His voice is calm yet chilling and eerie. He fled quickly after losing a fight to Choi Kang-lim. Beneath his mask, his skin has the bizarre texture of a wooden doll or a mannequin carved from black wood, revealing his true nature as a Gakgwi. He has the power to put opponents to sleep with purple breath. He belongs to the ghost team and can operate during the day. Alias: The Servant of the Eerie Mask.

The one who kidnapped Princess Hyowon. He takes the form of a black wolf with glowing red eyes. He is massive, male, and has razor-sharp teeth. A monstrous beast on the ghost team.