It's officially March, which means only one thing here at PopCrush: it's March Madness time, baby.

And this year's theme? The boy bands and girl groups of K-pop.

From long-established industry veterans like Girls' Generation and S.E.S. to today's hottest chart-dominators including Twice and Red Velvet, this year's battle royale hailing from South Korea will determine which act truly wears the crown among K-pop royalty.

Check out the bracket below to see who we've selected to duke it out for victory in PopCrush's 2017 March Madness series — then head into the individual battles to vote for your favorites.

The first round will end on March 10, the semi-finals will end on March 20, and the winner of the final battle will be revealed on March 31. Paiting!

WINNER: f(x)

F(X) Dimension 4 - Docking Station encore poster
S.M. Entertainment Japan / Avex Live Creative
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Final round:

f(x) Apink March Madness Girl Group K-Pop PopCrush
S.M. Entertainment / A Entertainment
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Semi-finals:

APink Sistar Girl Group March Madness K-Pop 2017
Plan A Entertainment / Starship
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f(x) Girls Generation Girl Group PopCrush March Madness 2017
S.M. Entertainment (2)
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Round One:

BLACKPINK Apink PopCrush Poll March Madness
YouTube (2)
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S.E.S. SISTAR K-Pop Girl Group March Madness PopCrush
YouTube (2)
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f(x) Red velvet march madness poll popcrush k-pop
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Twice Girls Generation March Madness Poll K-Pop
YouTube (2)
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bracket(girl)-final
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And when you're done voting for the girl groups, head over to vote for your favorite K-Pop boy bands.

K-Pop Groups That Disbanded Over the Years: