the location was about 0.5 km from the exit of the Noryangjin metro station. Just walk to straight ahead from the right of the exit and you'll find a signage to the market via a tunnel/underground pass. The price of seafood as expected are the most expensive during winter but the seller will usually add some free seafood together with what you bought. I think the stall has its own pre-assigned restaurants to cook your seafood, hence it is easier to buy all you wanted to be cooked from the same stall/seller. Easier to negotiate price as well. The restaurant is in the second floor but i found that the price to cook is quite expensive based on what i paid recently (it was mostly either plain barbeque/ simple spicy dish). Maybe you'll find it cheaper at other restaurant. There are shop selling meat as well and the price of wagyu beef is quite cheap (of course not halal). Most seafood sold are fresh and some are still alive.

Visited store #007 and bought a 1.5kg king crab and various types of clams for 75,000 won which I thought was reasonable. The lady owner gave additional clams and prawns. We were brought to a restaurant on the 5th floor which had photos of various celebrities which, presumably, dined there previously. The king crab was steamed and tasted absolutely fabulous - flesh was sweet and firm. The clams and prawns were cooked in a light broth style which was delicious. All in, cooking charges and soju was 35,000 which is fair, IMO.

We went on a Wednesday morning to the Noryangjin Fish Market. It was not crowds and we really enjoyed our visit. You can purchase the fish on the ground floor (1st floor Korean naming convention) and it is prepared on the 2nd floor. It is absolutely impressive. On weekends it might be crowds.