eSIMX
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eSIMX positions itself as the cheapest way to get online in Korea if you're staying just a week. Their headline plan runs $12.80 for 20GB over 7 days, which works out to $0.64 per gigabyte. The eSIM activates instantly via QR code scan, no waiting for physical delivery or complicated setup.
This is built for short-term tourists who want the lowest possible cost and don't need to stay longer. You get enough data for navigation, messaging, and casual browsing without excess you'll never use. If you're comparing per-byte pricing against other budget eSIMs like RedTeaGo, eSIMX wins for the week-long snapshot, though longer trips might push you toward larger pools elsewhere.