Well I think H!P always had a pretty steady following in Korea, so around the time Premium best was released Korea got their own special version. It came with a cellphone strap + 2 bonus songs in Korean (Suppin to Namida + Daite yo! PLEASE GO ON) and a DVD which came with the Suppin to Namida + Daite yo pvs and a special documentary thing of her in Korea.
After that she released five box sets exclusive to Korea called the "G-emotion single collection". They contained like 3 singles + the pvs and photo cards. I've been debating whether or not I should buy them >_>
So those best albums must have been popular, I never knew she was that popular in Korea either until I saw the screencap of her winning the award.