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Sunmi's debut extended play is titled "Full Moon." Released in February 2014, the EP marked her solo debut after her departure from the girl group Wonder Girls. "Full Moon" showcased Sunmi's versatility as a solo artist, blending elements of pop, R&B, and electronic music. The EP's lead single, "24 Hours," became a commercial success, establishing Sunmi as a rising star in the K-pop industry.