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I bought this sandwich from a corner store style place inside Incheon International Airport. It was only 1800 wan, which is less than $1.80 CAD, which is a super good deal for a sandwich! It was ham, cheese and cucumber, and it was stuffed as you can see.
It was super yummy and very filling too. I was in Seoul for a one day stop over from Hong Kong on my way back to Canada.
*Image is mine*