MicroESIM

MicroESIM is a global eSIM provider that serves 200+ countries and packages Korea-specific plans starting at just $0.86 for limited data. Plans run 1 to 30 days, and you can top up or extend your subscription through their app without buying a new eSIM. After you burn through your high-speed data, speeds drop to 512Kbps, which handles email and casual browsing.

Go with MicroESIM if your priority is the cheapest possible entry price or if you're already using them for another country on the same eSIM. The throttled-after-limit model works for light users, though the slow fallback speeds frustrate anyone doing video calls or downloads.