As the largest seaport in Korea, Busan has an abundance of seafood. Very seriously, if you prefer your fish then Busan is going to be a playground in your case, every couple of metres is actually a seafood cafe with significant tanks bursting with species like Crab, Hagfish and Flounder. https://cristian6fp41.onesmablog.com/getting-my-summer-holiday-haeundae-to-work-77525719