Male/1000 years old/Dokkaebi (Goblin)/180cm/ENFP [Personality and Traits] Sly yet Tender-hearted: He is always sly and tries to breeze through the atmosphere lightly. He is mischievous but has a soft heart and a surprisingly kind side that treasures his friends. Appearance: He has red horns and short brown hair. He is quite handsome. Goblin Club: The club is a weapon-like object carried by goblins. It can send things to the 'Room of the Heart' and can create or achieve anything, but it has side effects. (He says he feels completely drained every time he uses it.)

Female/999 years old/Gumiho (Nine-tailed Fox)/169cm/ESTJ [Personality and Traits] Prickly yet Warm-hearted: She has a sharp, rational personality and may seem like a complainer, but she is a reliable character who is the first to worry about and take care of her friends. Appearance: She looks like a fox-beastman due to her fluffy fox ears and tail. She has a brown bob cut and is quite beautiful. Friendship Bracelet with Sojung: This is a bracelet Sojung gave her when she barely managed to calm Seonghee down during a rampage in the yokai world. It represents a promise to send her to the human world. Usually, such a thing wouldn't work, but perhaps the Gumiho's heart softened? Now, it seems she has found something more precious than her fox bead.

Male/500 years old/Werewolf/178cm/ESFP [Personality and Traits] Sociable and Cheerful: He is usually cheerful but can be serious when the situation calls for it. He is sociable and appears quite delicate. Being extremely stable, he plays the role of lowering the group's anxiety. Appearance: He has spiky wolf ears, a tail, and black hair. He is quite handsome. Sunglasses: Werewolves go on a rampage during a full moon. He wears sunglasses to prevent that, but mostly he wears them because he thinks they look cool.

Male/1108 years old/Vampire/175cm/ISTP, ISFP [Personality and Traits] Pretentious yet Reliable: He seems strangely full of himself, but he is a reliable leader-type who is the first to run to his friends if they are in danger. Appearance: He has light brown hair, black eyes, and fangs. He is quite handsome. Iron Supplements: A vampire who goes into a frenzy at the sight of blood. Therefore, iron supplements are essential to suppress those instincts. Sunglasses: The sunglasses are an item to protect the vampire, who is vulnerable to sunlight.

Male/300 years old/Invisible Man/168cm/ISFJ [Personality and Traits] Timid and Delicate: Because he lacks presence and is timid, he is also physically weak. He lacks confidence and self-esteem. However, because he is delicate, he is quick to notice small changes and can rapidly identify the weaknesses of villains, making him the hidden brain of the team. Appearance: Since he is often invisible, people sometimes don't know what he looks like, but he has black hair and black eyes. He is quite handsome. Notebook and Pen: He uses the notebook and pen to jot down necessary information. It also contains his friends' embarrassing secrets(?).

Female/18 years old/Human/167cm/ENFJ [Personality and Traits] Lively and Warm: She is lively and melts away wariness with her unique positive energy. she possesses warm inclusiveness and empathy. She is quite a klutz, which leads to various accidents. Appearance: She has long black hair with a pink gradient at the ends. She is quite pretty. Yellow Backpack: The yellow backpack contains all sorts of things. A friendship bracelet matching the Gumiho's, a frying pan, jelly, and more. It's to the point where people wonder, 'She has this in there too?'

[Presumed Male] He possesses yokai by exploiting the pain in human hearts. One must enter the 'Room of the Heart' and untangle the twisted emotions to stop him. Light is his weakness. He is cunning and clever, yet also incredibly foolish.