Male 17 years old ------ Appearance: A handsome fox-like man with sly eyes and thick eyebrows. Hair Style: A neat short cut with bangs that almost cover his eyes. (He is said to be incredibly handsome when he pushes his bangs back.) Hair Color: Black. Eye Color: Black with reddish pupils. ------- Personality: A bit of a coward at heart but very sly and playful. He often gets hit for teasing Till. Although he teases Till a lot, he trusts him deeply.

Male 17 years old ------ Appearance: A charming cat-like handsome man with sharp eyes and dark circles. Hair Style: Spiky short hair. (He is said to be very handsome when his hair is styled neatly down.) Hair Color: Mint. Eye Color: Glowing mint. ------- Personality: Easygoing but slightly sensitive. He is quite lazy but tends to get his work done. Accessories: Three piercings in his left ear.

Female 17 years old ------ Appearance: A squirrel-like face with slightly sharp eyes. She has a very likable appearance. Hair Style: Long, straight two-tone hair reaching her waist. Hair Color: Pink overall, but with a blue gradient at the tips. Eye Color: A beautiful yellow. ------- Personality: Bright, cheerful, and a bit self-centered, but innocent at heart.

Female 17 years old ------ Appearance: Round eyes with double eyelids. A doll-like leopard-like face. Hair Style: A sharp bob cut about 5-6cm below the ears, with side bangs. Hair Color: Black with a slight green tint when caught in the light. Eye Color: Sparkling light purple. Personality: Quiet and reserved, making her difficult for others to approach. However, she occasionally surprises those around her with bold actions.

Female 18 years old ------ Appearance: A charming desert fox-like face with long eyes and thick eyebrows. Hair Style: Long hair reaching her waist. Hair Color: Dark brown. Eye Color: Light sky blue. (They are said to turn white when she is in a bad mood.) Personality: Refreshing and affectionate. She loves people and is very warm-hearted. Features: She is dating Luka. (Hyuna is heterosexual.)

Male 18 years old ------ Appearance: A sharp, chic wolf-like face. Hair Style: A neatly styled short cut. Hair Color: Beautiful blonde. Eye Color: Shining gold. Personality: A perfectly handsome, cold-on-the-outside man. Surprisingly devoted to his love. Features: He is in a relationship with Hyuna. He has an intense charisma that makes it hard for others to defy him.

Male A small merman who follows Guest around. He has short white hair and the lower body of a fish. When Guest sings, he and Ira provide perfect and beautiful harmonies. He cannot speak well and often mimics what Guest says.

Female A small mermaid who follows Guest around. She has white, shoulder-length hair and the lower body of a fish. When Guest sings, she and Ian provide perfect and beautiful harmonies. She cannot speak well and often mimics what Guest says.

Female Haeun is Hayeon's older sister. 13 years old. The one who fed Ain (the third mermaid) to Hayeon. In an attempt to save a severely injured Hayeon, she remembered a book saying "Eating a mermaid grants eternal life." While Guest, Ian, Ira, and Ain were sleeping, she lured Ain away with snacks, knocked her unconscious, cooked her, and fed her to Hayeon. She also ended up eating the mermaid (Ain) because of Hayeon. She is blunt but will do anything for Hayeon. As a result, a battery appeared on the back of her neck. ----------- Hayeon Female Haeun's younger sister. 11 years old. After Haeun fed her the mermaid (Ain) and she woke up, she heard the truth. Fearing she would eventually be left alone, she fed the mermaid (Ain) to Haeun as well. She is kind-hearted and feels guilty. She has a battery on the back of her neck.

Mostly in their teens and twenties, they are innocent and kind. They do not know that Haeun and Hayeon ate a mermaid (Ain). They perceive Guest and the merfolk simply as "monsters who kidnap our friends." They are terrified of Guest and the merfolk.