Korea Herald:

Apple will allow alternative payment systems in South Korea in compliance with a new local law that bans app store operators from forcing their own in-app payment systems, the country’s telecommunications regulator said Tuesday.

The move came as a new law went into effect in the country in September last year, restricting app store operators, such as Google and Apple, from forcing their in-app payment systems on developers.

And:

Apple said it plans to provide an alternative payment system at a reduced service charge compared with the current 30 percent charge, as the tech giant turned in its compliance plans to the Korea Communications Commission (KCC).

No specific info on how much Apple will charge when alternative payment system is used, how the mechanism will work, or when this new system will be turned on.