I like the effort here, but missing the mark. 3800 in flights. A long time sitting on your backside. Transport to and from airport. And who goes to SKorea just to turn around and come back. And the assumed someone living in BKK or HKT. Not happening
No worries. Just go thru the airport. They will direct you to overstay counter in BKK. If only one day, you will not likely be fined the 500 baht but receive a red overstay stamp
not really correct on the financial comparison as DTV is multi entry. If you want equivalent on retirement extensions, you need to add on 3800 baht per year also.