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Dumb Dumb is a song by the South Korean girl group Red Velvet. The song was released on June 17, 2015, as the title track of their first full-length album, XOXO. Dumb Dumb was a commercial success, peaking at number four on the Gaon Digital Chart and number one on the Gaon Download Chart. It also peaked at number four on the Billboard World Digital Songs chart.