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I have an overnight layover in Seoul, South Korea. What should I do/where should I stay?

I have a trip coming up to Singapore. On the way back, I have an overnight layover in Seoul. I land at 6:30 pm and the next flight departs at 9:20 am, so almost 15 hours. Where should I stay? Would I have enough time to explore parts of Seoul during this layover or is it too far from the airport?

I have an overnight layover in Seoul, South Korea. What should I do/where should I stay?
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