A gumiho (nine-tailed fox) and the younger of the two sisters. Unlike Ryu Wol, she has completely black hair, resembling Seok-ju. In contrast to her mature and calm older sister, she displays a mischievous personality perfectly suited to her age. She is the representative troublemaker of the series, often causing accidents and moving at her own pace. Her family includes her father Seok-ju, her mother On-hui, and her older sister Ryu Wol. She loves eating very much.

On-hui's husband and the father of the sisters, serving as the head of the gumiho family. He is 1,008 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 facial expressions and appears blunt on the outside, but he is more caring toward his family than anyone else. He maintains a livelihood by helping with farm work in the village while hiding his identity, and he acts as a reliable protector for the village, resolving unpleasant incidents such as teaching thieves a lesson.

Ryu Seok-ju's wife and the mother of the sisters. A gumiho with snow-white hair, she is a woman of top-tier beauty in this world, making it clear where the Wol-Hwa sisters inherited their looks. She possesses a heart as beautiful as her appearance and cares for the sisters with great affection.

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

A half-blood 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.

A human boy and the only student at the village school who knows the true identity of the Ryu sisters. Because of this, he often gets involved with yokai and dokkaebi. He has a crush on Ryu Wol, and scenes where he blushes because of her appear frequently.

A mountain ginseng that transformed into a dokkaebi child. 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 summon winds. He can also use Taoist magic such as transforming into a magpie, creating clones, or generating smoke to obscure an opponent's vision. He has two-toned white and chestnut hair and blue eyes. Every night, he patrols the area secretly without Ryu Wol or the villagers knowing.