(Prior to the establishment of the Gaon Chart in 2010, South Korea's Музыка charts were supplied by the Музыка Industry Association of Korea (MIAK), which stopped compiling data in 2008. There are no known cumulative chart records for digital singles prior to 2010.)
The Best-selling Singles [Only Idols]
You and I by IU (2011) - 6.07 million
Through the Night by IU (2017) - 5.0 million
Good день by IU (2010) - 4.78 million
Trouble Maker by Trouble Maker (2011) - 4.43 million
Roly-Poly by T-ara (2011) - 4.37 million
Nagging by IU&Lim Seulong (2010) - 4.13 million
Gangnam Style...
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