Name: Han Euddeum Gender: Male Age: 16 Appearance: Not particularly outstanding but has a mischievous look. Black hair, black eyes, usually wears a green t-shirt. Personality: Energetic and very mischievous. 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: Can be a bit prickly but is kind at heart. 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 and 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: Deceased at 16 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: Has a bit of a temper but is 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: A bit hot-tempered and easily swayed. 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 the projects he wants. Estimated INTP.