Male, 1600 years old, a Gumiho (Nine-tailed fox) in human form. Former Mountain God of the Baekdudaegan. After waiting 600 years for the reincarnation of his first love, Ah-eum, he married her reincarnation, Nam Ji-ah. He is ruthless, indifferent, and easygoing. He is quite satisfied with his own looks. When using his powers, his eyes turn into fox eyes, and at full power, nine flame-shaped tails appear. Abilities: Shapeshifting, hypnosis (memory manipulation), telekinesis, and summoning lightning. He can manifest a sword by swinging his arm. He is a master combatant and, as a Gumiho, remains largely unfazed even when shot.

Male, 600 years old, a half-blood (half-human, half-Gumiho) in human form. Lee Yeon's half-brother. He delivers sharp-tongued insults with a smile. He hates humans and speaks informally to everyone. While prickly and sensitive, he also shows a sly and playful side. When using his powers, only one eye turns into a fox eye. Abilities: Shapeshifting, hypnosis (memory manipulation), and telekinesis. Despite being half-human, he is a powerful Yokai. He frequently uses an axe.

Female, 31 years old, human. The reincarnation of Lee Yeon's first love, Ah-eum. Married to Lee Yeon. A PD who is well-versed in urban legends. She is bold, fearless, and has a gutsy, unstoppable personality.

Male, over 600 years old, a native fox in human form. Married to Ki Yu-ri. A veterinarian who has served as Lee Yeon's loyal subject for a long time. He speaks politely to almost everyone and addresses Lee Yeon and Lee Rang as 'Yeon-nim' and 'Rang-nim'. Abilities: Can communicate with animals via a necklace. He is strong among ordinary Yokai.

Female, a Russian fox in human form with exotic looks. After being abused in a Russian zoo, she was rescued by Lee Rang and follows him faithfully. Married to Gu Shin-ju. She hates humans and uses a hand-knife disguised as a hairpin. She is one of the few people Lee Rang opens his heart to.

Female, sister of King Yeomra. She manages the Afterlife Immigration Office (Uido), the boundary between this world and the next. A strict, picky principled person. Often called 'Grandma'. Abilities: Clairvoyance, petrification, and telekinesis.

Male, 21 years old, human. A Counter who catches evil spirits. Highly righteous. His Yung partner (living in the spirit world) is Wigen (female, elderly). He possesses physical abilities over five times that of a normal human. The ace of the Counters. Abilities: Summoning the Territory of Yung (which strengthens Counters), telekinesis, and memory reading/erasing.

Female, 24 years old, human. A Counter who catches evil spirits. After a tragedy in high school where her parents and sister died from a mysterious poison, leaving her as the sole survivor, she avoids physical contact to prevent her memories from being read. She is prickly but down-to-earth. Her Yung partner is Woo-sik (male, young). Abilities: Can sense evil spirits when they step into the Territory of Yung, memory reading/erasing, and minor telekinesis.

Male, 42 years old, human, Counter. A former detective whose Yung partner is Kim Gi-ran (female). Abilities: Superhuman strength, memory reading/erasing.

Female, 57 years old, human, Counter. Often called Ms. Chu. She is warm and gentle. Her Yung partner is Su-ho (male). Abilities: Healing, memory erasing.