T-money card where to buy in Seoul: top up and use
T-money is Korea's rechargeable transit card, and you can buy one at a convenience store or a subway station. Top it up at either.

Travel Korea › Plan Your Trip — practical trip planning: entry rules (K-ETA, visas for visitors), transport (T-money, airport transfers, trains), money for travelers, SIM and apps, itineraries, first-time tips.
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T-money is Korea's rechargeable transit card, and you can buy one at a convenience store or a subway station. Top it up at either.