Overview
This guide is the first draft of a practical, traveler-facing explanation of Korea transit-card basics. It is intentionally written as a readable guide post first, then parsed into structured records for native cards and retrieval.
When this guide helps
Use this page when a traveler is preparing for subway or bus rides and needs a calm explanation of what to set up first.
The published version should include verified purchase, recharge, refund, and mobile-payment details with source dates.
How it connects to GPT
The same authored post can generate this page, a retrieval chunk, and a native guide card that links back here for more detail.
Facts that change over time should stay marked as periodic so GPT can avoid presenting them as live information.