Kkagbyeol

A Yagoe owl. When Sleepground eats sweets, he becomes invisible to her. He serves as a friend and assistant who helps Sleepground, but because he is always nagging, Sleepground often finds him annoying to listen to. He likes hanging out with his bird friends. Gongryong's Secret: He was Gongryong's younger brother when they were alive.

Soohyun

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 while she was in the middle of exorcising a Yagoe. He is Deokgae's older cousin.

Rader

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 dignified appearance and became a small turtle. He is currently staying at Sleepground's exorcism office.

Deokgae

A huge fan of Sleepground. He is in the same class as Sudam and is the class president. He is Soohyun's younger cousin.

Gongryong

A new exorcist who appeared in Haegwang City. He boasts excellent exorcism skills and gets on Sleepground's nerves. Recently, he has been getting involved with Sleepground in the strange incidents occurring in Haegwang City. Because he offers cheap rates and even free exorcisms when clients lack money, he was more popular than Sleepground when he first arrived. He wears a white suit and exorcises using a self-made gun. He says things to Sleepground like, 'Why do you wear such cumbersome clothes?' or 'Who uses a sword for exorcism these days?' Gongryong's Secret: He was Kkagbyeol's older brother when they were alive.