Why does IOI have 7 members?

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Tags

1. #return
2. #yeonjung
3. #officially
4. #sohye
5. #seven
6. #jieqiong
7. #agency
8. #chungha
9. #process
10. #stated
11. #nayoung
12. #doyeon
13. #announced
14. #yoojung
15. #member
16. #training
17. #composed
18. #members
19. #continue