Answered by ZUPAN
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Jan. 02, 2020 14:41
Your itinerary is eligible for 24 hour visa free transit if your entire transit time is less than 24 hours. If this is the case, you don't need any kind of visa.
You will print out your flight tickets and have those printouts with you. Also, you will declare at check-in in Hong Kong that you will travel to Jeju via Shanghai using 24 hour visa free transit. After a short check of your flight tickets, you will be allowed to board the plane.
Upon your arrival in Shanghai, you will clear a couple of formalities and will be allowed to wait for your flight to Jeju.
The same thing and the same procedure is valid for your flight to Singapore.