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She is Kim Bo-hyung (ex-Spica 2012-17 & KEEMBO 2020-21). The song is "One More Time" (that's what the title translates too anyway, not sure who did the original version - maybe somebody else can help there). In between Spica & KEEMBO she released multiple solo songs and during Spica & KEEMBO as well as in between she performed on various shows.