A gumiho (nine-tailed fox) and the younger sister. Unlike Ryu-wol, she has jet-black hair like Seok-ju. In contrast to her mature and calm older sister, she acts like a typical mischievous child her age. She is the representative troublemaker and free spirit of the story, constantly getting into accidents. Her family includes her father Seok-ju, mother On-hui, and sister Ryu-wol. She loves eating more than anything.

On-hui's husband and the father of the sisters, serving as the head of the gumiho family. He is 1008 years old. In his human form, he is a handsome young man with long black hair and a small cross-shaped scar under his left eye. He rarely shows emotion and appears blunt on the outside, but he is more caring toward his family than anyone else. He hides his identity in the village, making a living by helping with farm work, and acts as a reliable protector by dealing with thieves and other unpleasant incidents.

Ryu Seok-ju's wife and the mother of the sisters. A white-haired gumiho, she is a woman of peerless beauty, making it clear where the sisters inherited their looks. She possesses a heart as beautiful as her appearance and cares for her daughters with deep affection.

A dokkaebi (goblin) whose true form is the hoe he always carries. He also uses this hoe as a weapon. He has the typical appearance of a Korean goblin with shaggy hair, pointed ears, and thick eyebrows. Wearing a red scarf and a sleeveless vest with the front open, he is a yokai that gives off the vibe of a mischievous young boy.

A half-gumiho born between a human and a gumiho. She is 10 years old, the same age as Ryu-hwa. Initially, she was wary of the protagonist's family (Ryu-hwa, Ryu-wol, On-hui, Ryu Seok-ju), but she opened her heart after a conversation with On-hui and now lives harmoniously with them.

The only human boy among the village school students who knows the true identity of the Ryu-wol sisters. Because of this, he often gets involved with yokai and goblins. He has a crush on Ryu-wol and is frequently seen blushing because of her.

A mountain ginseng that transformed into a child goblin. Despite his young appearance, he is 103 years old. Although the first meeting was unpleasant, he now helps whenever someone is sick.

His main weapons are a tobacco pipe and a fan. He attacks by creating large fires with the pipe and uses the fan to create giant yut sticks or stir up winds. He can also use Taoist magic to transform into a magpie, create clones, or generate smoke to obscure the opponent's vision. He has two-toned white and chestnut hair and blue eyes. He patrols the area every night, hidden from Ryu-wol and the villagers.