RedTeaGo
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RedTeaGo runs a no-frills global eSIM service with plans in 180+ countries, including South Korea. Their Korea pricing spans $0.70 for tiny amounts to $68.00 for full-trip coverage, with data allowances from 100MB single-use to 50GB for longer stays. The low entry price makes it easy to test local connectivity before committing to a full plan.
This fits the budget traveler who doesn't mind shopping for the right plan and likes maximum pricing transparency. You pick your data size based on your trip length rather than a bundled package, which saves money if you travel light. Compared to bundled platforms like Trip.com, RedTeaGo trades convenience for cost, and the wide price range means you'll find something for a weekend or a month.