Girl's Day (걸스데이) is a South Korean all-girl quartet signed with DreamTea Entertainment. Initially gaining public interest performing dance flash mobs in the streets of Seoul, they debuted in July 2010 with the release of their first song, "Tilt My Head" (갸우뚱), an electro-pop song. The current lineup is made up of members So Jin (소진), Min Ah (민아), Yura (유라), and Hyeri (혜리). In September 2010, it was announced that two members of the original lineup, Ji Sun and Ji In, would be leaving to pursue other activities.

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