[hl0m4n]

my friend is going to bankok, thailand. he found a great deal for about $1000 which includes tax, etc. but the catch he he will arrive in incheon south, korea at 5.30am and his flight from there to bangkok is 13 hours away.

so my friend has 13 hours in south korea to spare and he plans on going outside to seoul and exploring. but here is my question.

i thought you can't leave the airport when transfering. i thought when transfering you have to stay at the airport and you can't leave the terminal area (i guess thats the name for it) and you can't go outside.

so my question is can my friend leave and explore for the 13 hours he has or he has to stay inside the airport? what doesn't make sense to me is what happens to his luggage during the 13 hour seperation?

PS: im not sure if it's a connection or two different tickets.