@아롬 황 Thank you for reaching out to Microsoft Q&A. I understand that you want to know if by using ER Local SKU, you can connect between Korea Central and Korea South.
As mentioned in the docs, A key feature of Local is that a Local circuit at an ExpressRoute peering location gives you access only to one or two Azure regions in or near the same metro. Therefore, when you use the Seoul or Seoul2 peering locations, you can only connect to Korea Central and not to Korea South. However, if you use the Busan location, you can connect to Korea South only.
As you mentioned, ER Local is used to connect to one or two azure regions only which is therefore cost effective. Hope this helps.
Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
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