Yoo Jin (born in 2003) (girl in the middle) - Leader
Yoon Jung (born in 2004) (second to left with short hair) - Rapper
Ha Young (born in 2004) (second to right) - Vocal
Eun Jung (born in 2005) (first to right) - Vocal
Chae Rin (born in 2006) (first to left with pig tails) - Youngest Member
they're way too young, too sweet & too pure for this awful industry
edited to add in their birth year.
Sources: HI CUTIE 하이큐티 (1, 2), 신동윤 (3, 4)