I've been to South Korea a few times already and always enjoy it but I've always had an onward ticket before.
Now I need to fly home from a trip that's lasted over a year, but I still want to take my time and keep my options open.
There's a good choice of cheap flights from Istanbul to Seoul and from Seoul I can't decide yet whether to fly straight home or take a ferry to China, hitchhike to Guangzhou, and get a cheap flight home from there.
I can't really just buy the China-Australia flight now because I'm not sure yet whether I'll be able to get the Chinese visa easily enough or how long my remaining money will last.
I know Korea, like most countries, has rules saying you need an onward ticket, but in my experience many countries never try to verify that you have this ticket unless you fit some profile. So in this instance I would find first-hand knowlegde much more informative that pointers to a government website.
In practice does South Korea admit tourists with one-way tickets?