The R&B -inspired K-pop single debuts at No. 2 on Billboard's World Digital Song Sales chart, selling 4,000 downloads (in the week of Jan. 26 – Feb. 1), according to Nielsen Music. Previously, the quirky-cute girl group's best was a 3,000-download sales week for “Peek-A-Boo” in the week ending Nov.
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Red Velvet Earn Their Best Song Sales Week in the US Yet With 'Bad Boy'