i was wondering; f(x) debut was 2/3 years after SNSD; SNSD debut 2 years after CSJH; red velvet 4 years after f(x). Aespa debut was 6 years after red velvet but that could also be because of the NCT system; which had a lot of members; rotational group concept; took a lot more time to familiarize kpop fans with NCT.
i think SM may debut another girl group in 2023 because there is Helen; who is talented dancer and gorgeous. Everybody expected her to be in Aespa. i too was surprised she didn't debut with Aespa but i hope that means SM is keeping her for the next group; and considering she is 2003 liner; SM will want to debut the new girl group by 2023.