Comment by EE84M3i

Co-working spaces of all types are ubiquitous in Tokyo FWIW. Near my midsize station I had about 10 different providers in a 10 minute walking radius, some with multiple locations even!

Most have a selection of plans to choose from: hourly, daily, monthly, etc

I chose a bit more upscale one without a fixed seat. I pay ¥1100 (7.5 USD) I think for each day I use it, with a monthly minimum spend of ¥2200. It comes with free mediocre coffee/tea. It is consistently clean and library quiet as people follow the posted rules including minding the volume of their typing and headphones.

I would be surprised if the situation in Seoul was significantly different.