Technology showcases in Seoul (x-post from /seoul)

Sorry if something similar has been asked before, but I couldn't find anything using the search function.

I'm visiting Seoul for the week, and have lots of cool stuff done / lined up, but I particularly wanted to experience some high technology that South Korea and Japan are famous for, before I head back to sleepy Wales. I just went to Samsung D'Light and tried out the Oculus Rift for the first time, which was awesome.

As a bonus, I was wondering if there is any particular hotspot for eGaming culture or Starcraft (though I will just observe - not a player).

Thanks in advance! You guys are truly lucky to live in this city. I'm loving my time here.