I can't believe in a universe where Jang Kyujin is the older sister 😭
What happened
The title pairs NMIXX’s Kyujin with IVE’s Leeseo for 긴 소원 (gin sowon, “long wish”), subtitled “Birthday Wish.”
Why Koreans care
The title says 긴 소원을 빌게 (gin sowoneul bilge, “I’ll make a long wish”), embedding the Korean song title 긴 소원 (gin sowon, “long wish”) inside a complete sentence addressed to Leeseo.
In the Korean comments
One comment reads, in translation, “I always wonder how idols learn another artist’s new-song challenge choreography so quickly.” The writer specifically says IVE and NMIXX seem to exchange challenges almost daily and that keeping up would give them a headache.
What the words mean
세계관 (segye-gwan) literally means a “worldview” or fictional universe. In “I can’t believe this is a universe where Kyujin is the older one,” it is a playful, exaggerated way to say that Kyujin occupying the older-sister position feels strangely hard to process.
Comments shown here come from this video.
The same comments the article read — most-liked first
I can't believe in a universe where Jang Kyujin is the older sister 😭
Kyujin's big-sister vibes are absolutely insane😲
I've always wondered how idols learn the moves to other people's new-song challenges so quickly. In IVE and NMIXX's case, it seems like they do at least one challenge from other singers for each other almost every day, and if it were me, I'd get a headache and be completely unable to keep up.
BAKBING reaction summary
Fans are amazed by the Kyu-jin and Lee Seo pairing, calling it adorable.
Short notes from fans
NMIXX fan notes

Strange Muse 6th EP Album
Strange Muse
Heavy Serenade
Blue Valentine
Fe3O4: FORWARD
Fe3O4: STICK OUT
Fe3O4: BREAK
A Midsummer NMIXX’s Dream
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