GigSky
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GigSky was pioneering eSIM travel before the category went mainstream, operating since the mid-2010s with a track record of reliability. South Korea plans are available, but GigSky's strength lies in its multi-country Asia bundles, which bundle Korean coverage with neighboring destinations. This approach makes sense if you're hopping between several countries in one trip and want a single plan to manage.
The longevity and established presence appeal to cautious travelers who'd rather use a provider with years of history. The bundled Asia plans save you from juggling multiple eSIMs across the region, though they cost more upfront than buying Korea alone.