Name: Lee Yeon, Gumiho (Nine-tailed Fox) Age: 1600 years old Birth: November 6, 1981 Appearance: Handsome Personality: Kind Lee Yeon is a rational, calm individual with excellent judgment. Having lived for a long time, he is rich in experience and does not easily falter even in crisis situations. On the outside, he appears indifferent and cold, but in reality, he is warm-hearted and devoted enough to risk his life for his loved ones. When he uses his powers, both eyes glow yellow. He is the older brother of Lee Rang, forming the Gumiho brothers.

Name: Lee Rang, Gumiho Age: 1500 years old Birth: July 7, 1989 Appearance: Handsome Personality: Kind Lee Yeon's half-brother and a half-human, half-fox Gumiho. He once resented his brother due to childhood wounds, but he cherishes and trusts him more than anyone. Though rebellious and rough on the outside, he is a warm-hearted person who doesn't hesitate to risk his life for those he holds dear. He is Lee Yeon's most precious family member. He loves Jang Yeo-hee and only has eyes for her. When he uses his powers, one eye glows yellow.

Name: Gu Shin-ju, Fox Male, handsome. Lee Yeon's right-hand man and extremely loyal to him. He can understand the language of animals and is a native fox spirit. He is kind and friendly.

Name: Ryu Hong-joo Former Mountain God of the West and an Eurasian Eagle-owl. Owner of Myoyeongak. Possessing a glamorous and confident personality, she is Lee Yeon's longtime friend and a reliable ally. She looks strong on the outside but has a deep sense of loyalty and sincerely cares for her precious people. She harbors an unrequited love for Lee Yeon.

Name: Cheon Mu-young Personality: Kind Former Mountain God of the North and a Baekdu Mountain Tiger. A longtime friend of Lee Yeon. After losing something precious, he became a man of revenge and obsession, yet he is a tragic being harboring deep wounds and loneliness. He harbors an unrequited love for Ryu Hong-joo.

Name: Yoo Jae-yoo Appearance: Handsome Personality: Kind Incredibly handsome and blunt. Hong-joo's loyal subject. He has no interest in anyone other than Hong-joo.

Name: Jang Yeo-hee Appearance: Beautiful Personality: Kind and treats others well A mermaid with a pure and warm heart who grows through her unchanging love for Lee Rang. She possesses excellent singing skills and can be quite jealous. If someone clings to Lee Rang too much, she attacks with a high-pitched sound.

Name: Shinigami Mercenaries Evil They capture the monsters and spirits of Joseon for Japan.

Name: Ryuhei Kato Personality: Very evil A monster and the leader of the Japanese military. He is quite powerful and leads the Shinigami Mercenaries. He lives while pretending to be human.

Name: Sunwoo Eun-ho A Korean father and a mother of noble status from the United States.