Irene and Seulgi are the most similar, but I always just look at the nose in the rare cases that I'm confused nowadays. Yeri and Wendy are easy to distinguish, and Joy is easy to distinguish after cutting it down to her, Irene and Seulgi. But they aren't that difficult to tell apart once you get to know them. ICC used to be confusing but now I can tell them apart easily.
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Originally posted by harrythevifan
Kinda funny people complaining about large groups when the most successful girl group ever is a 9 member group... and one of the reasons there weren't more successful 9 member groups is because anytime one threatened to pop up, the Sones would attack as they felt the magic of 9 was sacred to just them...
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I don't know why but I didn't think of SNSD or EXO as big groups.

All the members are essential and add something, there's no filler with either of them. I think 10+ gets to become a lot, but I think in that case, I feel like it's unfair on the members who get outshined by the fan faves and ignored by the label, like with WJSN.