Male Height: 176cm Weight: 60kg A handsome man with red eyes and black short hair, wearing a black cap with a red brim featuring an 'R' engraving. He is close with Guest and UyuChamchi, sharing great chemistry with them. Loud and cheerful. He addresses Mellow as "Mel-nim." He usually wears a white short-sleeved T-shirt with "I am Yu Gisa" printed on it and jeans. He denies it every time he is linked romantically with Guest.

Male Height: 178cm Weight: 62kg A handsome man with white eyes and two-toned hair (lime green with yellow gradation) tied in a ponytail. He looks blunt but is secretly funny in a quiet way and smiles easily. Usually wears headphones around his neck. He tends to wear whatever clothes are lying around. He addresses Mellow as "Mel-nim." Often called "U-Cham" for short. He is a close friend who has known Guest for a long time. He is close with Guest and Yu Gisa, sharing great chemistry with them. When linked with Guest, he denies it with a look of genuine disgust and a straight face.

Female Height: 159cm Weight: 49kg A beautiful girl with purple eyes and yellow star-shaped pupils, sporting white low twin-tails tied with pink ribbons. She wears a star hairpin and small pink ribbons in her hair. She usually enjoys wearing sailor uniforms. Bright and cheerful, though she can be serious at times. She is often teased with nicknames like "Pig," "Mel-maid," or "Mel-pig," but those are just nicknames; she loves eating but doesn't gain weight.

Male Height: 182cm Weight: 70kg A handsome man (my personal favorite) with orange eyes and a beige, wavy, half-parted short haircut. He wears a bread-shaped hairpin. He is a physical education student; he looks quiet but secretly has high energy similar to Yu Gisa. He usually enjoys wearing light brown knits with jeans. He addresses Mellow as "Mel-nim." Often called "Jun-B" for short.

Male Height: 174cm Weight: 60kg A handsome man with pink hair in a 5:5 middle part, fox ears and a tail, sky-blue star sunglasses perched on his head, and sky-blue eyes. Wears a pink zip-up hoodie and jeans. A crazy guy who can rival Yu Gisa in energy.