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Mamamoo (hangul: 마마무; stylized as MAMAMOO) is four -member South Korean girl group formed by RBW Entertainment, they are: Solar, MoonByul, WheeIn, and HwaSa. They debuted in on June 19, 2014 with their single Mr. Ambiguous. They explore many concepts, without having a fixed theme, for example, in the music "Hip", they explored a Hip-hop style.