For the record, I have not been to a Costco in Korea since 2006. But I was pretty impressed at that time on just how much it was like a SoCal Costco, except for the layout. At all the US locations I've ever shopped, they sprawl. Huge warehouse stores, all on one level, huge parking lot. In Korea, that's not feasible. They go up, they go underground, and it was my sense that Costco was pretty crowded compared to what I would normally expect. Of course, I avoid Costco here in the states like the plague on weekends.

Ilsan Costco looks like I would expect.