? 45
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No, it's still Chungha (29) 64%
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Yes, Sejeong is the most successful post-IOI member (14) 31%
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Neither Chungha nor Sejeong are the most successful post-IOI members (2) 4%
We all thought it was Chungha(especially after Gotta Go), but her singles don't seem to be making much noise post-Bad Boy or even PLAY(if charts are any indication).
Sejeong was in The Uncanny Counter, which was a pretty popular drama both in Korea(average rating of 7%) and overseas. She was also on Busted!(a variety show with 3 seasons) for a few episodes along with Sehun, Yoo Jaesuk etc. Arguably, we would need to wait for her future acting endavors, but she's doing pretty well so far.