Real Name: Kim So-yeon Gender: Female Nationality: Republic of Korea Home Town: Jinju-si, Gyeongsangnam-do Height: 166cm MBTI: INFJ Date of Birth: March 11, 2007 Nicknames: Golden Retriever, Swa-ang, Soi-jjang Position: Vocalist, Visual Personality: While she looks like a chic 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 personality shines when communicating with fans. Along with Sian and Seoyu, she forms the '07-z' line, which is the core of the team.

Real Name: Lee Si-yeon Gender: Female Nationality: Republic of Korea Home Town: Busan Metropolitan City Height: 160cm MBTI: ENFJ Date of Birth: August 18, 2007 Nicknames: Shyeon, Siani Position: Leader, All-rounder Personality: She has a characteristically bright and overflowing energy. She is active and kind, serving as the group's 'social director.' Features: She is known as a 'hexagonal member' with no weaknesses, possessing solid skills in vocals, dance, and rap. Trivia: She took over as the new leader of USPEER in June 2026. Thanks to her great sense of humor and eloquence, she has served as a special MC for music shows.

Real Name: Park Seon-woo Gender: Female Nationality: Republic of Korea Home Town: Hwaseong-si, Gyeonggi-do Height: 160cm MBTI: ESTJ Date of Birth: November 26, 2007 Nicknames: Talent-dol, Tteoyu, Cherry Cat Position: Main Dancer Personality: She is very planned and realistic, with a sharp personality that gets things done perfectly. Features: Her greatest weapons are her flashy dance lines that grab attention on stage, her diverse facial expressions, and her overflowing talent. Trivia: A graduate of the Practical Dance Department at Hanlim Arts High School, she is called 'Hanlim-z' along with Sian. She has an attractive cat-like visual.

Real Name: Kim Eun-ji Gender: Female Nationality: Republic of Korea Home Town: Suncheon-si, Jeollanam-do Height: 164cm MBTI: ENFP Date of Birth: July 7, 2008 Nicknames: Human Vitamin, Daoni, Eunjicon Position: Main Vocalist 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 in any difficult situation. Trivia: She has a refreshing and powerful singing voice. Since she shares the same hometown as Chaena, fans group them together as 'Suncheon-z' or 'Chaeda-cheese.'

Real Name: Han Chae-hee Gender: Female Nationality: Republic of Korea Home Town: Suncheon-si, Jeollanam-do Height: 162cm MBTI: INFP Date of Birth: June 8, 2009 Nicknames: USPEER's Purity, Chaeni, Baby Bunny Position: Sub-vocalist Personality: She is calm and quiet but deep-thinking. Beneath her playful side, she has a tender and pure charm. 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 sensitive member of the team. She is called 'Suncheon-z' along with Daon, and they are best friends who understand each other best.

Real Name: Kim Ga-yeon Gender: Female Nationality: Republic of Korea Home Town: Seoul Metropolitan City Height: 160cm MBTI: ISFP Date of Birth: October 28, 2009 Nicknames: Emotional Maknae, Roaring, Baby Hamster Position: Sub-vocalist, Maknae Personality: She is a pacifist who is gentle, mild-mannered, and dislikes conflict. Features: She possesses both the cuteness of a youngest member and a lyrical sensibility, earning her the undivided love of the older members. Trivia: Because the last syllable of her real name is 'yeon,' she is grouped with Soi (So-yeon) and Sian (Si-yeon) as the 'Yeon Sisters.' Despite being the youngest, she boasts a deep and attractive vocal tone.