The point is, they're not simply keeping the collective bargaining rights because they're too difficult to change since the 1940s. The ROK have no qualms making massive changes to the very core of their constitution, including rewriting what got in the way of a corporatist dictatorship under Park.
Enjoy https://github.com/line/armeria from a unionized tech company of South Korea!
Edit: if you want to learn more, here is a news article titled "Samsung Electronics concludes its first collective bargaining" (Maeil Business, 2021-08-12) https://news.v.daum.net/v/20210812160601200
> #1 game company (Nexon)
Aren't Startcraft and League of Legends more popular? Being the #1 game company in South Korea doesn't imply you make the #1 games there.