I'm surprised that it's between 2NE1 & T-ara. I would have swear it would have been 2NE1 vs. SNSD or BEG vs F(x). I would have never guessed that SISTAR would have lost that many songs already.
Wanna was released as the lead single off of KARA's second album, Revolution. The song
peaked at #1, becoming KARA's second single to hit the top of the charts.