March Madness 2017 is a month-long competition on PopCrush to determine the best of the best of South Korean boy bands and girl groups.

This round is now over! Vote for Girls' Generation in the semi-finals here!

The battle begins today between TWICE and Girls' Generation — two troupes with plenty of members and plenty more fans — now going head-to-head in the first round of PopCrush's 2017 March Madness series.

The adorable girls of TWICE can't stop bringing the cute, from their debut with "Like Ooh Ahh" in 2015 to "TT" all the way to their latest release, "Knock Knock." The girls dropped a reissue of their third EP, repackaged as TWICEcoaster: LANE 2, in late February of this year and are actively in promo mode.

Girls' Generation have long since positioned themselves as one of the premiere K-pop girl groups in history, having debuted all the way back in 2007 and still going strong today. While most of the members have spent the past two years working on solo projects, there are strong rumblings that the girls will celebrate their 10 year anniversary later this year with a massive comeback.

The battle starts now: place your vote between f(x) and Red Velvet. This round ends on March 10.

Join the conversation on social media! Use #PCMarchMadness to discuss this year's competition.

Girls' Generation Through the Years: