cheapest way to leave korea?

Any country?

Go to Panminjon, step over the border and ask for political asylum in North Korea! :-)

Thanks for the constructive advice - and now for anyone who can actually answer my question...

Hydrofoil from Busan to Fukuoka comes to my mind (KRW 115000, single), but you need to move down to Busan unless you're already there.

If you can read Korean, www.072.com sells last-minute discouted flight tickets (return tickets, even if you don't want the return part) where you can grab tickets to China or Japan for KRW 100000~130000 pre-tax. (est. TAX are also shown on the website)

Very rarely you might see an urgent dirty cheap single ticket offer to SE Asia (mostly BKK) listed (KRW 130000 inclusive*), but such an offer doesn't come up everyday.

Why? What have you done???

hahaha, ive done nothing but im backpacking and on a tight budget and transport to/from korea is PRICEY to say the least, just seeing what my options are. Thanks for the tips guys.