Fresh seafood tastes very good in Korean Seafood Soondubu Jjigae. Especially the special flavor of fresh clams. If you live close to a fish monger, that’s what I recommend.
However, the ease and convenience of frozen seafood packs makes this an easy weeknight meal. Stock up when they go on sale and stash in the freezer. Seafood freezes very well. Once defrosted, you can’t even tell it’s been previously frozen.
FYI Asian markets usually sell packages of mixed frozen seafood. The mixed seafood packages provide little bit of everything: mussels, clams, squid, and shrimp.