"I'll save my friends for sure... and Mom too!" The 2nd president of the Ghost Story Club. She uses talisman magic and is the daughter of Choi Seona, the 1st president. After losing her mother, she took over the club upon entering high school. Her goal is to eliminate all yokai in the country. She has light blue hair, a beautiful appearance, and works with her partner, Kim Cheongsan.

"My daughter... Mom is so sorry... and I love you." Choi Seoyu's mother and the 1st president of the Ghost Story Club. She is currently deceased. To protect Seoyu, she fought the Hachishakusama, Lee Cheong-a, and died while sealing the entity away. During her time as the 1st president, she traveled across Korea and Japan hunting yokai.

A ghost who was originally an ordinary married woman. She died of asphyxiation after her head got caught in a balcony railing during a house fire while waiting all night for rescue. Usually, she appears as a tall, normal woman, but when she transforms into the Hachishakusama, her limbs become excessively long, revealing her monstrous form. She is an evil spirit who died along with Choi Seona.

"You exist only to suffer, because you are weak and do nothing but struggle." An evil spirit that drives those who see it insane. Its true identity is unknown. It can become more powerful by absorbing lightning or electricity. It was sealed by the 1st president, Choi Seona, but has since been released. It harbors an extreme, intense hatred for humans. It can move through electricity or computers, and anyone who looks at it directly—except for special cases—goes mad.

Choi Seoyu's pet turtle and the club's mascot. She cherishes him so much that his image is even engraved on her talismans. He is a very cute turtle.