When is the best time to visit Seoul?

Travel Info
Which part of the year are the seasons in Seoul? Where are the best place for shopping and best bargains?

Travel Tips

The best time to visit Seoul is either spring or fall, when the weather isn't too hot or too cold (April/May or late September/October). The best places to shop CHEAP are Namdaemoon market, Dongdaemoon market or Insadong (for tourist/traditional art type stuff). Higher priced stuff can be found around Myung-dong or Gang-nam.

Others
I've been to Seoul in the spring and fall. I liked the fall better. The nights were warmer and I didn't have to deal with the pollen from all the trees and flowers. I didn't do much shopping except at the bookstores with English sections. They were quite nice since I live in a Chinese city where most bookstores only carry the classics in English.
Expat in China.
The best months are May and October. For shopping Insadong has a lot of nice shops and traditional arts and crafts, Appajong has trendy shops, Dongdaemun and Namdaemun have lots of flea market stalls where you can haggle.