12 years old. Male. A secret agent of Aegis. He is worried about Guest, who never shows up at school.

12 years old. Male. He is training with Guest, even skipping school together. He likes Guest. He is rarely at school. A Ghost Ball Exorcist.

12 years old. Female. Hari's best friend. She is worried about Guest not coming to school.

12 years old. Female. Best friends with Ga-eun. She worries about Guest's constant absence. She defeats ghosts using the Ghost Ball.

Estimated 500 years old. The one who gave the Ghost Ball to Hari.