Jisan Rock Fest was pretty awesome. No matter where you go, people know how to rock out. I really enjoyed seeing Jimmy Eat World, Fall Out Boy and Weezer. I even heard some awesome korean rock!
If you have the opportunity to come here, do it. Just immerse yourself into their culture and you will start to love it. When I first arrived to Korea I thought their food looked disgusting and did not want anything to do with it. After I met a girl, I started eating more and more of the korean food, it turned out to be very delicious!
I have two more years back in Japan until my enlistment with the Air Force is up. I am still not sure if I want to reenlist, but if I do, I want to come back to Korea for a few years. Even if I decide to get out, I think the first place I look for a job will be Korea, hopefully with the Air Force as a GS/Contractor.