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A screenshot of ChatGPT on desktop. At the top, ChatGPT's output listing examples of Seoul subway stations with "yeok" in the name: Yeoksam Station (역삼역) literally “Yeoksam Station.” Here the first 역 is the historical “relay station,” while the final 역 means a modern train/subway station. Yeokchon Station (역촌역): “Yeokchon Station,” from “relay-station village.” Sinyeoksam Station (신역삼역): “New Yeoksam Station.” So in names like 역삼역, the syllable 역 appears twice with two related but distinct meanings: the first 역 is the old place-name element “relay station”; the second 역 is the ordinary modern word “railway/subway station.” This is not a coincidence. Modern Korean 역 “railway station” developed semantically from the older meaning “relay station.” Both are written with the same hanja 驛. The sidebar is about Sinyeoksam station, and it says: "Sinyeoksam Station is a subway station located in the Gangnam District of Seoul, South Korea... Line: Seoul Subway Line 9." After this, the human asks: "On which line is the Sinyeoksam station? What are the stations before and after it?" ChatGPT response is: There is no currently operating Seoul subway station called “Sinyeoksam Station” (신역삼역) as of 2026. I mentioned it because the form 신역삼 (“New Yeoksam”) exists as a place-name pattern in Korean, but I should not have implied that there is an actual station by that name in the Seoul Metro system.