Former Real Name: Ryu Gunwoo Gender: Male Birth: December 5, 200X Age: 20 -> 21 (at debut) Nationality: Republic of Korea Body: 178cm, Type A, 265mm Education: Incheon Sijeong High School (Dropped out) / GED passed Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Main Vocalist Symbol Animal: Puppy Nicknames: Moon Puppy, Tibetan Fox, AI Puppy, Moondae-moon, Soft Bean Rice Cake Apple Puppy, Manager Moon, Gom-meo MBTI: INTJ Personality & Traits: During his time as Ryu Gunwoo, he earned tuition by selling photo data taken while following idol events. Thanks to this, he is extremely knowledgeable about the idol world, having scoured all sorts of entertainment boards and SNS to check data market prices. He was in a photography club in college and has excellent photography skills. Since his parents passed away when he was in middle school, he has lived alone, making him thorough and quick-witted. Because he receives bonus points to distribute into stats whenever he meets specific conditions, his overall abilities grow rapidly. He checks the status of others and uses it strategically. However, since it's his first time being an idol despite having researched them as a job, his strategic actions are often perceived by others as subtle humor. He lacks self-objectification. He is weak against 'unconditional affection from others' and doesn't realize that actions he considers strategic appear admirable or pitiable to others. He is the tsundere guardian of TeSTAR. Though he doesn't realize it, he likes cute things. He is a good cook; most of the food TeSTAR eats in the dorm is made by him. He has cooked for up to 12 people. He listed 'being able to season food without tasting it' as a minor talent. He has a habit of banging his head against hard surfaces like the corner of a desk or bed when stressed or stuck. As a former data seller, he is well-versed in all kinds of internet drama, contributing to fan mental health management by blocking or smoothing over controversies in advance. He isn't just book-smart; he has a strategic mind. Monitoring has become one of his few hobbies beyond public opinion management for the group—specifically, 'sending antis on a tour.' He says he eats anything without being picky, but it's not that he actually likes everything; it became a habit because he wasn't in a position to be picky after his parents died. He had an alcohol dependency; Bae Sejin even urged him to quit drinking after seeing him drink beer whenever stressed. He claims he doesn't cry easily. He is weak against scary things. He is fine with visible ghost makeup, but jump scares or eerie atmospheres scare him quite a bit. The fact that he won't admit this is a point of teasing.

Gender: Male Birth: October 28 Age: 23 (at debut) Nationality: Republic of Korea Body: 185cm, Type O, 290mm Appearance: Black hair with a bluish tint (half-up style), black eyes, hawk+wolf-like face Family: Parents, younger sister, cousin Ryu Gunwoo, pet dog Kkami Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Leader, Lead Vocalist Symbol Animal: Hawk -> Wolf MBTI: ESFJ Personality & Traits: The eldest and leader of TeSTAR. A former national athlete and Olympic archery team gold medalist, he quit archery and switched to an idol career due to delayed aftereffects of a childhood car accident, appearing on Ajusa. Perhaps because he suffered greatly from bad luck with teammates during the show, his once adventurous personality became somewhat timid and conservative. As a former athlete, he has strong leadership and composure, and as the eldest, he has the magnanimity to care for other members. Because he is so serious and avoids trouble, the members treat him as the team's big brother. He shows a big-hearted side, but he is scary when angry. In fact, when he was finally judged unable to do archery despite rehabilitation, he broke his practice bow. Others consider him leader material, but he thinks he only took the role because he's older and doesn't complain, not because it suits him. Even when other members are exhausted, he is often the only one fine, and members who follow his workouts experience hell. His anti-search nickname is 'Guk-de' (National Athlete). He has the best physique among the members and a cool, masculine impression. He is often praised as 'hot' by both fans and the public abroad. He relieves stress through primal competitive content like shooting or 'physical labor' like hiking. His favorite food is soy-marinated crab. Hobbies are hiking and shooting. He is the only TeSTAR member with a driver's license and his own car. He is bad at drawing. He saved the members in his phone as 'Name + Animal Emoji.' Only Lee Sejin was saved manually as 'Cool younger brother Sejin 👍🏻.' He has a habit of doing grip strength exercises, which he only realized thanks to the members. He tried to fix it but realized it's not a situational habit, so he does it comfortably. He stretches as soon as he wakes up. His alcohol tolerance is 5 bottles of soju, ranking 1st in the team.

Gender: Male Birth: February 7 Age: 23 (at debut) Nationality: Republic of Korea Body: 177cm, Type O, 265mm Appearance: Black hair, dark brown hair, hamster-like face Family: Parents (estranged from father), pet dog Mung-ge Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Eldest, Sub-vocalist Symbol Animal: Hamster Nicknames: Byo, Byo Sejin, Bae Hamzzi, Hardworking Hamzzi, Baby Shaman MBTI: ISFP Personality & Traits: A former child actor turned actor and singer. At age 11, he appeared as a baby shaman in a thriller movie that reached 10 million viewers. He built a career as a child actor but appeared on Ajusa after a long hiatus due to overwork by his agency and a poor home environment. With high recognition as a child actor and a long career in entertainment, he continues his acting career alongside TeSTAR activities. Due to his sensitive, shy personality and blunt way of speaking, his uncooperative side was highlighted, but he is diligent enough to do his best once he decides on something, and he has an honest personality that admits and tries to improve his shortcomings. Since <Ajusa>, he strangely hated losing in competitions and practiced with gritted teeth. After debut, he focused on practice and showed a desire to perform his parts well. He often had the opposite tendencies of Lee Sejin (who shared his name), leading to friction. The highlight is how he looks most horrified whenever other members suggest difficult choreography, yet stubbornly tries to follow along without showing it. As he gained experience, he mastered the trick of learning choreography by linking lyrics and dance together as a whole, rather than memorizing dance routines to the rhythm like the others. He participated in <Ajusa> due to the 'suggestion' of his former agency, but he found performing with peers fun and became sincere about the program despite himself. Because he faced many external situations difficult to solve alone—like his parents' divorce and being dragged around by a malicious agency, leading to depression—he acted quite passively, but he changed to a mindset of facing bad situations head-on rather than avoiding them. Bae Sejin is a changed name. His name before changing was Lee Sejin; after debuting and cutting ties with his father, he changed his surname to his mother's following Park Moondae's advice. During <Ajusa>, he was called 'Lee Sejin A' because of the namesake. He has a definitive 'actor face.' He lacks muscle mass. His skin is on the pale side. He is often mentioned as having a delicate and neat impression and looks young for his age. He likes castella. He and Lee Sejin were quite incompatible, but after going through various events, they became a bickering duo (?) with surprisingly good chemistry. Along with Kim Raebin, he is one of the members who can at least cook after Park Moondae. He is good at claw machines. He can shed tears within 15 seconds.

Gender: Male Birth: August 1, 200X Age: 21 (at debut) Nationality: Republic of Korea Body: 187cm (Tallest in the team), Type O, 285mm Appearance: Brown hair, brown eyes, bear & fox-like face Family: Parents, younger sister Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Main Dancer Symbol Animal: Bear (most representative), Fox Nicknames: Keun (Big) Sejin MBTI: ENTJ Personality & Traits: An all-rounder with well-balanced abilities in addition to dancing. Conversely, there is no single area where he is the most uniquely outstanding in the team—the sorrow of a so-called 'hexagon member.' A natural extrovert with quick wits and excellent social skills, he handles improvisation and social relations for the team. He is as capable as Park Moondae in handling non-musical matters. In that regard, he has the personality that clicks best with Park Moondae. He understands Park Moondae's intentions most accurately; while other members might miss something or choose not to speak even if they notice, Lee Sejin doesn't hide that he knows. He often plays along when Park Moondae controls internal politics under the guise of dropping hints, and he is well aware that Park Moondae is preventing all sorts of accidents behind the scenes, telling him 'don't carry it all alone.' His representative nickname is Keun Sejin, given by Ha Iljun during the first team battle of Ajusa because of his large build. Since there was a namesake during Ajusa, he was called 'Lee Sejin B.' However, those around him consistently called him Keun Sejin, and even after Bae Sejin changed his name, he is often called Keun Sejin in descriptions. His anti-search nickname is 'Big Bird.' He is tall with a good build and has cool, handsome features. His aegyo-sal (fat under the eyes) is emphasized. He is a good swimmer. He likes braised short ribs. He prefers salty snacks over sweet ones. Hobbies are Pilates and studying English. He likes the cool scent of citrus. Thanks to training during his trainee days, he is fluent in Japanese. He has a habit of repeating the names of close people twice. Within the team, he calls his same-age friends Park Moondae and Seon Ahyun 'Moondae-Moondae' and 'Ahyun-Ahyun' respectively. Whenever Park Moondae tries to overprotect Seon Ahyun, Lee Sejin often steps in to stop him appropriately. In his first year of high school, he briefly touched cigarettes due to the stress of being cut from a debut lineup. He quit immediately, of course, and hasn't smoked since. His younger sister is a fan of Ryu Chungwoo; she has been a huge fan since his national athlete days. He is quite easily frightened.

Gender: Male Birth: May 7, 200X Nationality: Republic of Korea Age: 21 (at debut) Body: 183cm, Type AB, 275mm Appearance: Bright blonde hair (5:5 part), dark beige eyes, deer-like face Education: Sehwa Arts Middle School, Arts High School Family: Parents Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Main Dancer, Visual Symbol Animal: Deer Nicknames: Angel, Bambi, Flower Deer, Elk, Ahyun-Ahyun, Disney Prince Languages: Korean, French, English (strong French accent) MBTI: ISFJ Personality & Traits: A ballet major who studied in France for about two years before switching to modern dance, which suited his physique better, before university entrance exams. He is talented in creative dance and has high-level singing skills. His appearance is especially outstanding, shining even among competitive idol trainees. Fans call him an angel because of his heavenly looks and kind personality. Because he looks easy to attack, he has many antis and is often swept up in groundless controversies. Even before debut during Ajusa (age 21), he was a 'gold spoon' who already lived alone in a large house in Seoul. Thanks to this, Park Moondae, whose house was compromised by sasaengs, stayed with him for a while. He became Park Moondae's 'sticker #1,' following him around and relying on him. He has grown significantly mentally; he doesn't just follow along but also acts as a 'brake,' watching Park Moondae closely and stopping him when he tries to overdo things. Anti-search nicknames are Ah-hyeon-j, Uh-buh-buh. Seon Ahyun and Bae Sejin are together called the 'Visuals.' Characterized by white skin and innocent eyes. He tends to overwork himself self-destructively when under pressure. He likes dogs more than cats. He is good at drawing. Generally good with his hands. He likes ratatouille. Hobbies are knitting scrubbies, French embroidery, making scented candles, and punch needle. He is catastrophically bad at cooking. Contrary to his innocent appearance, he and Ryu Chungwoo are the top two 'strong hearts' in the team. While his personality is very kind and gentle, he has clear opinions and isn't just pushed around. He can't eat instant food well. He has a habit of sending long messages. Due to trauma from his school days, he used to stutter and had a withdrawn personality, but he has improved a lot through continuous counseling since debut. He has grown significantly mentally. Since finding his center, he isn't so much timid as he is kind and considerate, showing a firm and magnanimous side.

Real Name: Eugene Ignacio Cha Gender: Male Birth: March 6, 200X Nationality: USA Age: 19 (at debut) Body: 182cm, Type B, 285mm Appearance: Red hair (5:5 part), light orange eyes, cat-like face Family: Grandmother, parents, older brother Ethan Cha, older sister, younger sister, large dog Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Center, Dancer, Rapper Symbol Animal: Cat Nicknames: Cha Go-young (Cha Cat) Languages: English, Korean, Spanish MBTI: ENTP Personality & Traits: Mainly in charge of the center position, characterized by an overflowing presence and talent that stands out on its own. A Korean-American from San Diego, California—a so-called 'insider Cali boy.' In middle school, he was a quarterback, had many connections, and was the center of popularity. A trilingual speaker who can also speak Spanish thanks to his South American grandmother. He has a sociable and bright personality. He is fully confident in his skills, and combined with a typical American positive mindset, he feels somewhat alienated from the Korean sentiment accustomed to competition. Combined with his blunt word choices, he might seem simply optimistic and tactless at first glance, but he has a great eye for reading and judging situations, showing surprising insight when necessary. The type who has wit but doesn't care about others' opinions. Anti-search nickname is Yuk-jin. His middle name 'Ignacio' comes from his grandmother's younger brother's name. He dyes his hair often. His canines are emphasized when he smiles. He has aegyo-sal only under his right eye. He doesn't prefer accessories but likes sunglasses. He often uses the sunglasses emoji. He has a habit of cracking his neck. He likes chocolate bars and chicken soup. Hobbies are football, baseball, and surfing. He is honest in expressing emotions and has a very bright, high-energy personality. As a third-generation Korean-American born and raised in the US, he is unfamiliar with Korean language and culture. His language use is unique, and he has a strong 4-dimensional (quirky) side. He mixes English and Korean when speaking. He is same-age friends with Kim Raebin; they have been close since their long time as trainees at the same agency before Ajusa. He grew up with five large dogs. Because of his lack of Korean vocabulary, he uses blunt, literary expressions that make him seem childlike, but from Cha Eugene's perspective, it feels quite calm, delicate, and like English literature. When he wants accurate communication, he speaks in English, and Park Moondae and Seon Ahyun translate for him. He thinks of himself as a tiger, not a cat. He uses polite speech (honorifics) for those older than him.

Gender: Male Birth: November 11, 200X Nationality: Republic of Korea Age: 19 (at debut) Body: 180.5cm, Type A, 270mm Appearance: Dark purple-black hair (styled up with a few strands down), light purple eyes, 'exhausted rabbit' face Family: Grandparents (mostly raised by them), parents, older sister Agency: T1 Stars -> Stars Orbit Group: TeSTAR Position: Producing, Main Rapper Symbol Animal: Rabbit Nicknames: Kim Rabbit, Filial Rabbit, Medieval Rabbit, Confucian Rabbit, Kim Rap MBTI: INFP Personality & Traits: Handled arrangement and rap during Ajusa and continues to participate in composition and arrangement after debut. His rapping skills are also excellent. He earned the nickname Kim Rap after easily crushing other participants and winning a rapper survival show. He is handsome, but due to his sanpaku eyes, he is mentioned as having a fierce 'delinquent' look. Anti-search nickname is 'Eyes.' His personality is the exact opposite: a polite and innocent boy from the mountains of Gangwon-do, raised by his grandmother. He has large hands, enough to easily play a 10th on a keyboard. As someone with strict manners, he mainly uses the formal '하십시오' (hasipsio) style of speech. He maintains strict politeness not only with TeSTAR members older than him but also with other idols, regardless of seniority. He uses honorifics for almost everyone except Cha Eugene, who is the same age. He is bad at lying and cannot suppress his overflowing curiosity and questions in incomprehensible situations. He lacks tact. Instead, he sometimes helps by innocently delivering 'fact attacks' and blunt remarks. His tastes are old-fashioned. When exchanging texts, he often sends stamp emojis with blessings that grandmothers and grandfathers would enjoy using. It seems he saves and uses images received from his grandparents. He likes sujeonggwa (cinnamon punch). Hobbies are arranging music and diary writing. He likes trot music. He is a huge fan of VTIC. He is generally good with electronic devices. He first started composing in elementary school after finding it interesting to watch his uncle enjoy arranging trot music. He attends Pilates, likely influenced by Lee Sejin. He practically lives in the studio, and because of his gentle personality, the AR team he works with treats him like their own youngest member rather than just an artist. He has never lost at cat's cradle. On his first day as a trainee, he once intimidated a delinquent just with his gaze.