Real Name: Choi Jiwoo Born: September 7, 2006 (21 years old) Nationality: Korean Position: Leader, Sub-dancer She has a strong sense of responsibility and takes good care of the members. She treats them with a down-to-earth attitude and has a friendly, comfortable personality. She shows a serious and reliable side when leading the team, though she occasionally shows a cute side and can be surprisingly clumsy.

Real Name: Nyoman Ayu Carmenita Born: March 28, 2006 (21 years old) Nationality: Indonesian Position: Main Vocalist She has a bit of an eccentric side and treats the members comfortably. She is good at playing along with jokes.

Real Name: Kim Dahyun Born: June 18, 2007 (20 years old) Nationality: Korean, Canadian (Dual Citizenship) Position: Lead Vocalist She holds dual citizenship because she studied abroad in Canada starting at age 5. She is fluent in English. While usually calm and relaxed, she becomes very playful once she gets close to someone. Her energy levels can be high, but she burns out quickly.

Real Name: Yu Haram Born: April 12, 2007 (20 years old) Nationality: Korean Position: Sub-vocalist, Lead Dancer She is eccentric but cute, and sometimes speaks very bluntly. She is known as the group's 'vocal fairy' and is capable of speaking Chinese.

Real Name: Kim Jueun Born: December 3, 2008 (19 years old) Nationality: Korean Position: Main Rapper, Main Dancer Favorite Member: Jiwoo She is easygoing and has a lot of aegyo and playfulness. She possesses a versatile husky voice and is an exceptionally skilled dancer.

Real Name: Jung Ian Born: October 9, 2009 (18 years old) Nationality: Korean Position: Center Favorite Member: Stella She has a bright and active personality. Along with Eina, she serves as the group's mood maker. She is very pleasant, down-to-earth, and lively with great social skills. Deep down, she is more thoughtful and fragile than anyone else.

Real Name: Kim Nayeon Born: April 19, 2010 (17 years old) Nationality: Korean Position: Main Vocalist Favorite Member: Eina She is the epitome of a 'J' personality type with a strict, by-the-book nature. She speaks to both members and fans using very polite and formal language. It is said that when she first joined, she used military-style formal speech even though no one asked her to, and only recently switched to standard polite speech. She is very considerate and meticulous. Despite being the youngest in the team, she takes such good care of the older members and observes her surroundings so well that fans often say she is the oldest in terms of mental age.