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Coaster가 아니에요.

For those who know what this is, pardon me for my ignorance. It may be common in Korea but I have not seen it before in Singapore or anywhere that I have been. I was issued this thing when I ordered my ice blended vanilla and tuna sandwich. The staff was explaining its function to me in Korean and I did not grasp any of her explanation. Anyway, I took it along with me to the seat while I waited for my sandwich and drink to be prepared. After a while this thing lighted up and vibrated. It was only then I realised that it was meant to inform me that my orders were ready for collection. How interesting. I was simply amused at my own ignorance.