Why are K-pop groups so big?

The rapid global growth of Korean music over the past decade has puzzled non-fans (and even experts), and it seems that the size of K-pop groups might be a mystery, too.

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Why are K-pop groups so big? : 네이버 블로그

They're the biggest band in Asia, but Big Bang's days may be numbered - The Washington Post

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Why it's so difficult for American K-pop groups to succeed - ft. A2K

Why do K-pop groups have so many members? - Quora

twice: Twice K-Pop girl group: All you need to know - The Economic Times

BTS's 'Beyond the Story,' 5 takeaways from the K-pop biography - Los Angeles Times

Why are K-pop groups so big?