Interesting. I've seen some videos of the empty apartment blocks with small empty commercial areas below them.
Actually, now that I think about it. Korea is actually migrating towards a more Chinese vibe (I call it Americanisation of their planning) where they build the buildings super far apart and make it all way less walkable but still bikeable.
The city I refer to that recently disappointed me and is brand new in Korea is Dongtan, take a look if you get a chance. I think Korea has slipped down the slippery slope unfortunately. Either that or they just haven't filled in the lines yet, but I doubt that. It's just more car-centric.
Things built 5-10 years ago weren't like this, but then neither was the car status symbol race.