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BillboardK-Pop Hot 100: IU Hits No. 1 With 'Friday,' Ties Chart RecordBillboardThe lead single from the repackage version of IU's impressive "Modern Times" album, the bouncy "Friday," debuts at No. 1 on the K-Pop Hot 100 -- earning the 20-year-old her fourth chart topper. The feat ties her for the most No. 1s on the chart with ...