Making a hit song is obviously an immensely difficult task. Making a hit song stay as the number one hit song for any given time is even harder.
There have only been six idol groups so far that have mega-hit songs that managed to stay as number one throughout an entire year. This achievement is one that even singer-songwriter IU couldn't manage to pull off, though of course, she has other record-breaking accomplishments under her belt.
So Hot (Wonder Girls)
Gee (Girls' Generation)
Bad Girl Good Girl (Miss A)
ROLY POLY (T-ara)
Bang Bang Bang (Big Bang)
Cheer Up (TWICE)
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