TWO FACE IN DONGDAEMUN MARKET, SEOUL

Dongdaemun is the biggest shopping mall in Korea. There are two type of market in the same place. 

1) SHOPPING MALL : You can easily find many shops & restaurants which is served by company. It's impossible to negotiate the price due to the price tag system. If you are good negotiator (or want to try to find a fun for discount), I recommend the traditional market near this shopping mall. From my point of view, foreigners usually go to the shopping malls, but domestics try the traditional market first. If you have the nice eye, you can find what you want for the lower price, even the quality is almost same. 

2) Traditional Market : Good product for cheap price!!!
There are many self-employeed shops just near the Dongdaemun shopping mall. Do not buy the clothes or shoes for the price that the seller offer at the first time. There is the room to negotiate the price. I cannot say that how much you can get the discount because it depends on the goods and merchant. HOWEVER, I usually get whatever I want for the lower price compared with the shopping mall.