A few meters down from the main Itaewon intersection opposite the Hamilton Hotel, towards the direction of Han River is a neighborhood of shops selling antique and vintage items that would interest antique shoppers and collectors.
Passing through the shops one morning, I saw a lot of interested shoppers rummaging through small candelabras, vintage plates, porcelain cups and flashy furnitures.
From Exit 3 of Itaewon Station, make a u-turn and look for Taco Bell. Head down on that Taco Bell side and walk straight towards the direction of the Han River. A few steps down you would see these shops, and even after you pass the intersection, you can turn right and see a few more.