I recently took a trip to Busan with my sister, and the fish market was my absolute favorite part of the excursion. Here's roughly how the fish market thing works:

When you walk into the massive building, you'll see scores of vendors trying to slang their catch to you for cheap. They're not aggressive or pestering; some of them can speak-a-da English fairly well and are open to haggling. They'll be delighted to see your foreign face. (Continued...)