To put a background to the article, you should read the translations provided by oniontaker here. The gist of it is that the members of T-ara were disgruntled with Hwayoung not being able to perform due to her injury and publicly dissed her on their Twitter accounts (although the company is trying to chalk it up as a hack).
This article shot to #1 on Nate as well as their board, Pann.
Article: Hyomin covers Hwayoung's rap part during her inury, 'Forgets lyrics and cheats by writing lyrics on hand'
Source: X Sports News via Nate
1. [+472, -13] You must be just dripping with determination, so much so that you can't even memorize your own song's lyrics ㅋㅋㅋ
2. [+467, -13] Hyomin, who does not have any determination, why don't you try becoming more determined ^^
3. [+451, -12] Lack of determination ^^ fightingㅋ
A pann post giving a rundown on the Twitter controversy has similar sentiments.
1. [+40, -0] They're so cruel;;; They're how old and they're still acting like little kids? I'm honestly so very disappointed with T-ara
2. [+30, -0] I've seen a lot of bullying within girl groups, but I've never seen one that made it so blatantly obvious like this, as well as with evidence. Sigh, Hwayoung should just leave the group.