transport
Incheon Airport to Seoul: the fares and last trains, checkedAREX fares and departure times read off the operator's own Korean pages, including a free-travel rule that English guides leave out entirely.
Every guide to Korea says 2026. Almost none of them mean it.
Fares go up. Last trains move. An app quietly stops taking foreign cards. The article that told you otherwise stays online for years, and you have no way to tell. So everything here carries the day someone actually looked, and a link to the Korean page they looked at.
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connectivity
Korea eSIM or SIM card: it depends on whether you need a numberData-only eSIMs lock you out of Kakao T, delivery apps and most Korean signups. Plus the face-scan rule that started in July 2026.