Girl's Day (Korean: 걸스데이) is an all-female South Korean K-pop group formed by Dream T Entertainment in 2010. The group premiered with members Sojin, Minah, Yura, Hyeri, Jisun, Jihae, and Jiin. Jisun and Jiin officially left the group in 2010, while Jihae left in late 2012.
Despite the loss of these three members, as a quartet Girl’s Day went on to become one of the most popular and commercially successful groups of their era. The group's biggest hits include "Twinkle Twinkle", "Hug Me Once", "Expect", "Something", "Darling", and "Ring My Bell."
In 2019, the four remaining members decided not to renew their contracts with Dream T Entertainment, but have not disbanded.