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CSR (/si-ɛs-ɑːr/; Korean: 첫사랑; RR: Cheotsarang; lit. First Love) is a South Korean girl group formed and managed by A2Z Entertainment.  CSR is an abbreviation of Cheotsarang (lit. First Love). The company stated on the name that, "taking advantage of all members being seventeen years old, the group plans to show various interpretations of first love and tell the story of the members growing up year by year".