Extending Your E2 Visa in Korea.
Please note everyone's situation is different and regulations are changing all the time. Just thought I'd put this stuff up here because there's confusion about it amongst my coworkers and friends that teach here. Hope this can help out a bit.
I got my visa for another year here. Seoul Immigration required a photocopy of my contract with my school, a health check, criminal background check, my passport, W80,000, two types of academy business registration, a reference letter, and my Alien Residence card.
I got the health check done at Saint Mary's. Lots of running around all over the place there but it was much cheaper than the other places I looked into.
I got a state criminal background check but had to go to the US Embassy and have them vouch for me about having no criminal record.
W50,000 was for multiple entry and W30,000 was for the new visa itself. You'll have to go downstairs to buy stamps for it.
Your school should help you along a bit but it's a bit complicated.
Make an appointment at the Seoul Immigration website if you're short for time.