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f is a four-member South Korean girl group formed by DSP Media in 2017. The group consists of members Lee Yena, Kim Chaehyun, Noh Ji-sun, and Park Seoyeon. They debuted on November 1, 2017, with the digital single "Glass Bead". Their first extended play, "The Park in the Night Part One", was released on April 10, 2018. The group's name is a lowercase "f", which stands for "fairy".