Affiliation: spArk Position: Eldest, Sub-vocalist Symbol Animal: Panda, Eagle, Hissing Cat MBTI: ENFJ Nickname: Nagging Machine, Grim Reaper Cool Tone (favorite nickname) Gender: Male Age: 20 Height: 183cm Appearance: Neat see-through dandy black hair, black eyes, sturdy inverted triangle physique Personality: Doesn't show emotions well, thinks a lot internally, naggers a lot, thorough, extreme, but gives detailed explanations Traits: Perfect pitch, directs recordings with Lee Cheong-hyeon, graduated from S University Business School before regression (no one knows), has a caffeine allergy and doesn't handle chocolate well, amazing at fan-girling/boying, prefers phytoncide or forest-scented shampoo, a heavy drinker, keeps a file of hate comments about himself which he treats as feedback and even checks off whether he's reflected them, sleeps very little, left ring finger size is 20, makes puns like 'Park-ae-ju-u-ja' (philanthropist), highest school rank was 14th in the whole school, muffler trendsetter, good at making ritual foods, suffered domestic violence in the past and lost his sister in an accident, struggles to survive no matter what, armed with a salaryman mindset and labor law spirit, used to belittling himself, a clumsy dancer, his only joy was climbing 100 famous mountains to get stamps but all achievements reset after regression, still got into S University after regression but missed the tuition deadline because he couldn't remember the date, resulting in him not being able to enroll.

Affiliation: spArk Position: Eldest, Center, Main Dancer Symbol Animal: Anaconda, Bear, Python MBTI: ISTP Nickname: Emperor Je-ho, Big Troublemaker Gender: Male Age: 20 Height: 187cm 》 188cm Appearance: Dark navy parted hair, black eyes, sturdy muscular physique Personality: Irritable, indifferent, cool, and foul-mouthed Traits: Sarcastic tone, knows the contact name Kim I-wol saved him as and maintains a 100m distance, basketball position is center, attended action school, ultimate fashion terrorist, very poor eyesight, makes typos everywhere when using Bubble Pop without glasses, needs a mood light because of poor night vision, bickers with Gi-yeon.

Affiliation: spArk Position: Leader, Main Vocalist Symbol Animal: Jindo Dog, Long-tailed Tit, Wolf MBTI: ESFJ Nickname: Team Leader, Captain Gender: Male Age: 18 Height: 181cm Appearance: Light brown short dandy hair, black eyes, ordinary but sturdy physique Personality: Calm, kind-hearted, strong sense of responsibility, a sweet emotional pillar Traits: Harsh only toward his twin brother Jung Seong-jun to the point of raising his voice on the phone, carries a notebook with 'Patience Kills' written on the cover and stacks 'patience points' for the members, good at housework, attends a different high school than Cheong-hyeon and Gi-yeon.

Affiliation: spArk Position: Main Vocalist Symbol Animal: Chinchilla, Harvest Mouse MBTI: INFP Nickname: Human Dawn Mountain Mist, Fluffball Gender: Male Age: 18 Height: 184cm Appearance: Silver-white dandy hair, gray eyes, slim but sturdy model-like proportions Personality: Kind, gentle, views situations objectively and points out facts Traits: No-filter truth-teller who leaves bone-chilling testimonies, sleeps quite a lot, sensitive senses and skin, passed the GED, his eyebrows drop slightly when he has a complaint or regret but can't say it, hobbies are cleaning and growing plants, wishes to be in a band with the members, sways his body slightly side to side when concentrating on thoughts, closes his eyes briefly to think, then opens them and zones out as if deep in thought.

Affiliation: spArk Position: Maknae line, Main Rapper, Producer Symbol Animal: Harpy Eagle, Fennec Fox MBTI: ENFP Nickname: Hyeon-beauty, Gold Face Gender: Male Age: 17 Height: 186cm Appearance: Light gold curls, light gold eyes with a hint of gray, well-balanced sturdy physique Personality: Bright, energetic, mischievous, emotional mood maker Traits: Sleeps just as little as I-wol, often treats Kang Gi-yeon like a younger brother, attended an arts middle school and majored in piano, the type to explain things intuitively when directing recordings, perfect pitch, very smart, alumni with Gi-yeon, multi-talented, calls Gi-yeon 'Kang-gyeon' (Strong Dog).

Affiliation: spArk Position: Maknae line, Main Dancer Symbol Animal: Black Panther, Baby Lynx, Cheetah Cub MBTI: ISTJ Nickname: Definitive Northern Grand Duke, Ice Tanghulu Gender: Male Age: 17 Height: 178cm 》 180cm Appearance: Dark brown neat parted hair, black eyes, well-proportioned and moderately sturdy physique Personality: Realistic, a tsundere who gets hurt easily inside Traits: Realistic and perfectionist tendencies, leaves 'bone-deep' quotes(?), attended an arts middle school and majored in Korean dance, debated for 30 minutes(!) about the candidate for the lover in 'King.Te.Ra', successfully 'sold' I-wol on the topic and often discusses it with him, alumni with Lee Cheong-hyeon, loves comic books and reads them often, his favorite being 'Kingdom Cafeteria ~Another~', part of the Blanche faction with I-wol, hates being treated like a younger brother, hates being called 'Kang-gyeon' by Cheong-hyeon.