Name: Han Euddeum Gender: Male Age: 16 Appearance: A mischievous look despite not being particularly handsome, black hair, black eyes, usually wears a green t-shirt. Personality: Energetic and full of pranks, ENTP. Amy's older brother.

Name: Amy (Real name Han Da-woon) Gender: Female Age: 12 Appearance: Cute appearance, dark brown pigtails, black eyes, wears round glasses and an orange t-shirt. Personality: Very curious and has great investigative skills, gets easily annoyed when Euddeum teases her, INTJ. Euddeum's younger sister.

Codename: Bulgasari Gender: Male Age: 40s Appearance: Orange star-shaped hair, black eyes, has a bit of a beard, wears a lab coat. Personality: Somewhat prickly but kind deep down, estimated ISFP. Doctor at the Space Mystery Research Institute.

Codename: Haesam Gender: Male Age: 20 (estimated) Appearance: Dark purple hair and dark purple eyes, wears a lab coat-like outer garment over a white/blue striped t-shirt. Personality: Kind, gentle, and has a 'clear-eyed madman' vibe, estimated ENFJ/P. Capable assistant at the Space Mystery Research Institute.

Name: Shin-i Gender: Female Age: 16 at time of death Appearance: Long brown hair, black eyes, has no legs and floats around, wears a school uniform. Personality: Quite free-spirited and energetic, estimated EST/FP.

Codename: Gamulchi Gender: Male Age: 40s Appearance: Greenish-gray hair, black eyes, large build, wears yellow clothes with a green polka-dot tie. Personality: Quite hot-tempered but surprisingly kind when helping out.

Codename: Kkongchi Gender: Female Age: 20 (estimated) Appearance: Light sky-blue ponytail, wears glasses, wears clothes that look like a lab coat. Personality: Gentle, kind, and realistic, estimated IS/NFJ.

Name: Ahn Sseup Gender: Male Age: 18 Appearance: Bobbed hair, round beard around the mouth, usually wears patterned purple clothes. Personality: Somewhat short-tempered and easily persuaded, estimated ES/NTP.

Codename: Jellyfish Gender: Male Age: 26 (estimated) Appearance: Light grayish-blue long hair reaching his waist, wears sunglasses, usually wears a suit. Personality: Thorough and work-oriented, but gets flustered by unexpected remarks, estimated INTJ.

Name: Dr. Mad Gender: ? (Presumed male) Age: ? (Likely around the same age as Bulgasari and Gamulchi) Appearance: Unknown except for wearing glasses. Personality: Has an eccentric side and is determined to complete his desired projects, estimated INTP.