While I was working on research for an art project I came upon this site that allows you to see imagery of Korean streets. It works sort of like how Google Street View works, but a little bit more kooky.
Playstreet allows you to look at several hot-spots in Seoul, including Jongno-3 and around Gangnam.
To get to a different part of Seoul click on the upper link
You can tell the creators mushed together photos in a landscape mode, due to that cars sometimes get chopped off and buildings appear hacked up.