Big bang when the MV for Haru Haru was released in 2009. It was an immaculate moment for me. I was obsessed. Some of their albums are still incredible to this day.
Epik High too but they kind of linger between the kpop and R&B genre.
For a female group I'd say 2ne1 around the same time as Bigbang when their I Don't Care MV dropped.
Again I'd say......
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