Okay, so I have actually lived in Korea for 15 years, and am into self hosting, servers for media, etc.
What I can tell you is, you are fucked. Peering to anywhere other than Japan is a nightmare.
Give up and build your own server in your own home. No amount of peering tricks or CDNs will help you.
The best you'll get in terms of connections to major service providers is hosting in Dallas, which should get you around 100mbps.
Lemmy has become a weird place. You're being downvoted for being 100% correct. I have the same problem, I need Windows to use a similar suite of programs.
Yesterday, I had a similar experience, I was giving information that was 100% correct, and getting downvoted, while the other person was spreading factually false information that fitted the narrative of 'all companies and non FOSS bad', and guess which side the community supported.
Might be time to just go back to Reddit if the lemmy community is just going to actively support and reinforce anything that fits the hivemind narrative that is appearing regardless of truth.