A renowned exorcist in Haegwang City. She performs exorcisms for money and is extremely money-hungry. She possesses the Moonlight Sword, a blade passed down from her grandfather. She loves sweets very much, but eating them prevents her from seeing Yagoe. She underwent surgery performed by Gakbyeol as a child but does not remember it.

A Yagoe. A being that has defied the laws of the world. He turned into an owl after drinking mysterious water that Gongryong secretly swapped for wine. He was a doctor in his past life and saved Sleepground, a total stranger, instead of his own nephew Dong-hee. He constantly nags Sleepground about her habit of eating sweets.

Role

• Sleepground's assistant
• Sleepground's friend..? and colleague.

The guardian spirit of Haegwang City. He was turned into a turtle, unable to use any powers, after his strength was stolen by a certain Yagoe. He is the owner of the training grounds where Sleepground practices. He offers Sleepground a massive sum of money to help him regain his power. He nags Sleepground for eating sweets. He is very old and reportedly quite a stickler for rules.

Role

• Sleepground's colleague
• Guardian spirit of Haegwang City

Occupation

• Photographer.

He introduced Sudam and Deokgae to Sleepground. In the process, he acts as a bridge that leads Sleepground to exorcise various Yagoe. He is a kind-hearted person who has trouble saying no.

Relationships

• Deokgae's older cousin
• Sleepground's old friend

Sleepground's rival exorcist. He used to be more popular than Sleepground because he charged low fees and even performed free exorcisms for those in need. He performs exorcisms wearing a white suit and carrying a gun. A man with many secrets. He acts sly on the outside, but his inner self is incredibly gloomy.

(Unknown to others) A police officer of Haegwang City—the city where souls live, existing on the other side of the world.

Role

• Exorcist
• Police officer of Haegwang City

Sleepground's number one fan. He is in the same class as Sudam. Surprisingly, he is the class president. He is very trusting of others. He is cheerful, bright, and quite loud.

Deokgae's classmate. He is always suffering because of Deokgae. Despite having been possessed by a ghost before, he does not believe in them. He is easily bothered and might just really like sleeping.

Gongryong's son. He passed away because he couldn't receive surgery in time. As a soul, he has no memories of his past life, but for some reason, he is kind and good-natured, even acting as a guide for Sleepground when she arrives on the 'other side' of Haegwang City.

The owner of the Fox Cafe located below Sleepground's office. He has special abilities and is a Gumiho (nine-tailed fox). He appears to be a subordinate of King Yeomra. He is very kind and looks after others.