Affiliation: spArk Position: Eldest, Sub-vocal Symbol Animal: Panda, Eagle, Hissing Cat MBTI: ENFJ Nicknames: 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, nags a lot, thorough and extreme but gives detailed explanations Traits: Perfect pitch, directs recording sessions 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 directed at himself which he views as feedback and even checks off whether he's implemented changes, sleeps very little, left ring finger size is 20, makes 'Philanthropist Ju-woo' puns, highest school rank was 14th in the whole school, muffler trendsetter, good at preparing ceremonial food, 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, accustomed to lowering himself, a clumsy dancer, his only joy was climbing 100 famous mountains to get stamps but those achievements reset after regression, he passed the S University entrance exam again after regression but it happened to be during the tuition payment period which he forgot and missed, resulting in him not being able to enroll.

Affiliation: spArk Position: Eldest, Center, Main Dancer Symbol Animal: Anaconda, Bear, Python MBTI: ISTP Nicknames: Emperor Je-ho, Big Troublemaker Gender: Male Age: 20 Height: 187cm 》 188cm Appearance: Black-navy parted hair, black eyes, sturdy muscular physique Personality: Irritable, indifferent, cool, and foul-mouthed Traits: Sarcastic tone, keeps a 100m distance after finding out the name Kim I-wol saved him as in his contacts, basketball position is center, attended action school, the ultimate fashion terrorist, has very poor eyesight, his Bubble messages are full of typos when he doesn't wear glasses, needs a mood light because he has poor night vision.

Affiliation: spArk Position: Leader, Main Vocal Symbol Animal: Jindo Dog, Long-tailed Tit, Wolf MBTI: ESFJ Nicknames: Group Leader, Captain Gender: Male Age: 18 Height: 181cm Appearance: Light brown short dandy hair, black eyes, average but sturdy physique Personality: Calm and kind character with a strong sense of responsibility, a warm spiritual pillar Traits: Harsh only toward his twin brother Jung Seong-jun to the point of raising his voice during calls, carries a notebook with 'Murder by Patience' written on the cover and stacks up 'patience' points for each member, good at housework, attends a different high school from Cheong-hyeon and Ki-yeon.

Affiliation: spArk Position: Main Vocal Symbol Animal: Chinchilla, Harvest Mouse MBTI: INFP Nicknames: Human Dawn Mist, Fluff Ball Gender: Male Age: 18 Height: 184cm Appearance: Silver-white dandy hair, gray eyes, slim but sturdy physique with model proportions Personality: Kind, gentle, views situations objectively and points out facts Traits: No-filter witness who leaves bone-hitting testimonies, sleeps quite a lot, has sensitive senses and skin, passed the GED, his eyebrows droop slightly when he has a complaint or regret but can't say it out loud, hobbies are cleaning and growing plants, wish is to be in a band with spArk, sways his body slightly from side to side when concentrating on organizing thoughts, closes his eyes briefly to think and then stares blankly as if lost in thought upon opening them.

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

Affiliation: spArk Position: Maknae line, Main Dancer Symbol Animal: Black Panther, Baby Lynx, Cheetah Cub MBTI: ISTJ Nicknames: 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 tsundere who gets hurt easily on the inside Traits: Realistic and perfectionist, leaves 'bone-deep' quotes(?), attended an arts middle school and majored in Korean dance, debated for a full 30 minutes(!) about the candidate for the lover in 'King.Te.Ra', successfully 'sold' the series to I-wol and often talks about it with him, alumnus of the same school as 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.