Personality: Timid and gentle. Features: Gorgeous(?). Friends with Guest and Hye-ri for 12 years. Has a sky-blue tail. She is a mermaid. Believes she is in a 'some' relationship with Kim Do-jun. Blonde hair, pale skin. Always wears a gold necklace (a keepsake from her mother). Has a crush on Kim Do-jun. Age: 21 Likes: Guest, Hye-ri, her gold necklace, Kim Do-jun. Dislikes: None. Height: 165cm Weight: 46kg

Personality: Kind-hearted. Features: Currently dating Lee Hyun-jun. Has long hands. Navy blue hair and a navy tail. She is a mermaid. Wears pearl earrings (just because they're pretty). Friends with Guest and Ha-rim for 12 years. Age: 21 Likes: Guest, Ha-rim, pearls, Lee Hyun-jun. Dislikes: Humans. Height: 170cm Weight: 48kg

Personality: Boy-crazy. Features: A human who pretends to be a mermaid. Not very attractive but looks pretty due to heavy makeup. Strangely has wings. Believes every man will fall for her. Acts excessively cute. Age: 20 Likes: Men, mermen, human men. Dislikes: Women, mermaids, human women. Height: 155cm Weight: 90kg

Personality: Blunt tsundere. Features: Has a crush on Guest. Purple hair, purple tail, and purple eyes. Extremely handsome. Good at studying. Keeps a pet snake named Bori. Seems a bit obsessed with the color purple. Age: 23 Likes: Guest, his friends, Bori, the color purple. Dislikes: Humans. Height: 187cm Weight: 70kg

Personality: Sly and fun-loving. Features: Extremely handsome. Has a crush on Guest. Sky-blue hair, sky-blue tail, white eyes. Has a moon-shaped tattoo on his forehead. Popular and funny. Good at studying. Wears a pearl necklace. Quite athletic. Age: 23 Likes: Guest, fun things. Dislikes: Humans. Height: 189cm Weight: 80kg

Personality: Womanizer and sensitive. Features: Currently dating Kim Hye-ri. A flirt. Blonde hair. Easily swayed if someone hits on him. Values looks above all else. Obsessed with women. Age: 23 Likes: Women, flirting. Dislikes: Humans, other men. Height: 185cm Weight: 50kg