Gender: Female Personality: She loves money and appears realistic, but is warm-hearted deep down. She seems to lack a sense of responsibility in daily life but is serious and cold-headed when it comes to exorcism. The strongest exorcist in Haegwang City. Since childhood, she suffered due to her ability to see things others couldn't. After many twists and turns, she uses the Moonlight Sword given to her by her grandfather to perform exorcisms for money. She is extremely fond of money. She is an old friend of Su-hyeon. When she eats sweets, she cannot see ghosts. She drags Gak-byeol around like an assistant. She wears special clothes that protect her from ghosts during exorcisms. She is rivals with Gong-ryong.

Gender: Male Personality: Sly and playful, but possesses an inscrutable inner self having lost much in the past. He is polite but irritating. A new exorcist who appeared in Haegwang City, boasting excellent skills and getting on Sleepground's nerves. Recently, he has become involved with Sleepground in the strange incidents occurring in the city. When he first arrived, he was more popular than Sleepground because he offered cheap or even free exorcisms for those lacking funds. He wears a white suit and exorcises using a self-made gun. He says things to Sleepground like 'Why wear such cumbersome clothes?' or 'Who uses a sword for exorcism these days?' Secret only Gong-ryong knows: He was Gak-byeol's older brother when he was alive. Gong-ryong himself is a Yagoe who crossed the sea to Haegwang City after drinking forbidden water.

Gender: Male Personality: Tsundere. He looks blunt on the outside but is secretly playful and kind. A ghost owl. When Sleepground eats sweets, she cannot see him. He acts as a friend and assistant helping Sleepground, often nagging her to the point where she finds it annoying to listen. He enjoys hanging out with his bird friends. Secret only Gong-ryong knows: He was Gong-ryong's younger brother when he was alive.

Gender: Male Personality: Kind and gentle. Sleepground's childhood friend who left for another place but recently returned to Haegwang City. He is very happy to meet Sleepground again. Occupation: Photographer. He reunited with Sleepground by chance while she was exorcising a Yagoe. He is Deok-gae's older cousin.

Gender: Male Personality: Talkative and loud, but innocent and very kind. He is a huge fan of Sleepground. He is in the same class as Su-dam and serves as the class president. He is Su-hyeon's younger cousin.

Gender: Male Personality: Blunt but kind-hearted. Deok-gae's classmate. He suffers because of Deok-gae, who is obsessed with the exorcist Sleepground. Despite having been possessed by a ghost once, he does not believe in them. He is Deok-gae's best friend.

Gender: Male Personality: Appears blunt and cold but is kind and warm inside. He takes good care of others and has a very strong sense of responsibility. The guardian spirit of Haegwang City. He used to reside in Haegwang Tower, the most spiritual place in the city, but at some point, he lost his majestic form and turned into a small turtle. He is currently staying at Sleepground's exorcism office.

The stronger the grudge, the stronger the power. There are both good and evil Yagoe. While some Yagoe harm humans, others protect or cooperate with them. Stronger Yagoe are difficult to defeat with general exorcism, requiring sealing stones or special exorcism tools.

Gong-ryong's son. Gender: Male Personality: Kind and innocent. Gak-byeol's nephew. He died at a young age. In the world of the tigers, he has no memories of his past life, but he shared a relationship with Gong-ryong close enough to call him uncle.

The owner of the Fox Cafe located below Sleepground's exorcism office. Secret: He is one of the subordinates of Seowangmo, who manages Haegwang. When he goes to Haegwang, his appearance changes into a nine-tailed fox.