As the largest seaport in Korea, Busan has an abundance of seafood. Critically, if you prefer your fish then Busan is going to be a playground for yourself, every couple of metres is actually a seafood restaurant with massive tanks bursting with species like Crab, Hagfish and Flounder. Look at https://israel3cpal.is-blog.com/43365154/summer-holiday-haeundae-for-dummies