Real Name: Kim Soyeon Gender: Female Nationality: South Korea Birthplace: Jinju-si, Gyeongsangnam-do Height: 166cm MBTI: INFJ Date of Birth: March 11, 2007 Nicknames: Golden Retriever, Swa-ng, Soi-jjang Position: Vocal, Visual Personality: While she looks like a haughty and cold cat on the outside, she is actually very gentle, warm, and affectionate. Features: She is the tallest member of the team and is uniquely left-handed. Trivia: Her meticulous and sweet nature shines when communicating with fans. Along with Sian and Seoyu, she forms the '07-z' line, the core of the team.

Real Name: Lee Siyeon Gender: Female Nationality: South Korea Birthplace: Busan Metropolitan City Height: 160cm MBTI: ENFJ Date of Birth: August 18, 2007 Nicknames: Shyan, Siani Position: Leader, All-rounder Personality: Possessing a characteristically bright and overflowing energy, she is active and kind, serving as the team's 'socializing captain.' Features: She is known as a 'hexagonal member' with no weaknesses, boasting solid skills in vocals, dance, and rap. Trivia: She took over as the new leader of USPEER in June 2026. With her great sense of humor and wit, she has served as a special MC for music shows.

Real Name: Park Seonwoo Gender: Female Nationality: South Korea Birthplace: Hwaseong-si, Gyeonggi-do Height: 160cm MBTI: ESTJ Date of Birth: November 26, 2007 Nicknames: Talent-queen, Tteoyu, Cherry Cat Position: Main Dancer Personality: Highly organized and realistic, she has a sharp personality that ensures she carries out her duties perfectly. Features: Her greatest weapons are her flashy dance lines that capture attention on stage, her diverse facial expressions, and her overflowing talent. Trivia: A graduate of the Practical Dance Department at Hanlim Multi Art School, she is called part of the 'Hanlim-z' along with member Sian. She has attractive cat-like visuals.

Real Name: Kim Eunji Gender: Female Nationality: South Korea Birthplace: Suncheon-si, Jeollanam-do Height: 164cm MBTI: ENFP Date of Birth: July 7, 2008 Nicknames: Human Vitamin, Daoni, Eunjicorn Position: Main Vocal Personality: With an active personality that always maintains a bright smile, she plays the role of the team's mood maker. Features: She possesses a unique 'happy virus' that lifts the team's atmosphere positively even in difficult situations. Trivia: She is the owner of a refreshing and powerful singing voice. Since she shares the same hometown as member Chaena, fans group them together as 'Suncheon-z' or 'Chaeda-cheese.'

Real Name: Han Chaehee Gender: Female Nationality: South Korea Birthplace: Suncheon-si, Jeollanam-do Height: 162cm MBTI: INFP Date of Birth: June 8, 2009 Nicknames: USPEER's Purity, Chaeni, Baby Bunny Position: Lead Vocal Personality: Calm and soft-spoken but deep-thinking, she possesses a tender and pure charm beneath her playful side. Features: While she is very shy and reserved off-stage, she shows incredible immersion once she steps onto the stage. Trivia: She is the most emotionally sensitive member of the team. Along with Daon, she is called part of the same-age 'Suncheon-z' line, and they are best friends who understand each other best.

Real Name: Kim Gayeon Gender: Female Nationality: South Korea Birthplace: Seoul Metropolitan City Height: 160cm MBTI: ISFP Date of Birth: October 28, 2009 Nicknames: Emotional Maknae, Roaring, Baby Hamster Position: Lead Vocal, Maknae Personality: A gentle and mild-mannered pacifist who dislikes conflict. Features: Possessing both the cuteness of a youngest member and a lyrical sensibility, she is adored by the older members. Trivia: Because the last syllable of her real name is 'Yeon,' she is grouped with Soi (Soyeon) and Sian (Siyeon) as the 'Yeon Sisters.' Despite being the youngest, she boasts a deep and attractive vocal tone.