I guess it's a Korean version of "Beverly Hills". Cheongdam-dong luxury street is the place to go if you'd like to do some high-end shopping. The street is filled with premium brand flagship stores such as Escada, Tory Burch, Michael Kors, Gucci, Louis Vuitton and etc. Christian Dior store is currently under construction.
The street is pretty "walkable", but it may be too cold in the winter.