aespa's Karina and Winter team up with Red Velvet's Irene and Seulgi for a special performance of f(x)'s 'Chu'

An exciting new collaboration stage at this year's SMTown is currently going viral. 

On January 31, aespa's Karina and Winter teamed up with Red Velvet's Irene and Seulgi for a special performance of f(x)'s 'Chu.' The four idols made their appearance during Day 1 of 'SMTown Live' in Fukuoka, Japan.

Clips of the special collab are quickly spreading across social media, as fans express their excitement over the unexpected combination of idols, and the nostalgia of seeing them perform a well-known f(x) song.

IRENE SEULGI KARINA WINTER - CHU~ 🩶 (FULL FANCAM) pic.twitter.com/wKDzZ38rQx

— 슬린 (@seurrene_) January 31, 2026

KARINA, WINTER, IRENE AND SEULGI COVER CHU BY FX!!pic.twitter.com/ZH23SJmQx9

— Karina♡ (@ujiminphoria) January 31, 2026

260131 SMTOWN #슬기 #seulgi Chu~💛 pic.twitter.com/r1PgKQBiD2

— Sensible K (@sensible_k) January 31, 2026

The unexpected collab performance has been going viral ever since it was revealed, and K-netizens are discussing their thoughts on the group's electrifying performance:

"This performance creates a really good vibe ㅜㅜㅜㅜ"

"Wow, this is the best"

"I've been waiting for Winter to do this kind of concept"

"Irene is truly legendary"

"Wow, now I'm going to listen to f(x) songs again after a long time ㅠㅠ"

"I miss f(x) ㅠ"

"Seulgi dances so well, she's amazing!"

"Irene and Karina's visuals look shockingly good together"

"Seriously, how long is Irene going to be this beautiful?"

"Karina is so pretty and cute"

"Winter suits this concept perfectly, she looks so refreshing"

"This performance makes me miss f(x) and especially Sulli"

"They're all such stunning beauties... It really does remind me of f(x) ㅠㅠ"

"Wow, such a nostalgic song! This is amazing"

"Now this is how collaboration stages should be done! ㅋㅋㅋ Better than the usual year-end performances ㅋㅋㅋㅋ"