Yes, regrettably you still do, even for the several several hours. It's simply because within their neutral eyes, anyone who will get into Korea could just elect to remain there as an alternative to return to your airport, so they wish to have a specific degree of facts about the individuals they let into the country. It is just a precaution to them, but boy is it a hassle for tourists!

I am US citizen and may fly air copyright to ICN, I may have 22 several hours layover and change to Asiana airline to China.

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