4b started in 2019. Fisrt graders this year where mostly born in 2017.

The number of new students starting school was widely expected to drop this year, as only 357,771 babies were born in 2017 -- which is when most of the first graders for this year were born. It marked a steep drop from the 406,243 born the year before.

https://m.koreaherald.com/view.php?ud=20240226050665

No causality to see here. Let's wait 2026.