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)

S.M. Entertainment Japan / Avex Live Creative

Final round:

S.M. Entertainment / A Entertainment

Semi-finals:

Plan A Entertainment / Starship
S.M. Entertainment (2)

Round One:

YouTube (2)
YouTube (2)
YouTube (2)

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: