One of the most interesting aspects of Korean daily life is their markets. Last year I had the chance to go to Korea and took a train to Busan. I was so disappointed, no zombies at all.
The Jagalchi Market 자갈치시장 is the largest seafood market in the country. Not only you get to buy seafood as fresh as it possibly can be, you can have it prepared and eat it right there. You choose the fish and they prepare it for you in the most authentic Korean style.