After eying this place for months, I finally made it over there for lunch and am very glad I did. Soondooboo weather is upon us, and that's what I had, with seafood. It was very good, if not quite up to BCD's version, which I may be romanticizing because that's the first place I had soondooboo, and I still think it's the best. Helen's had plenty of good quality, properly cooked seafood - not those tiny shriveled mussels or itty-bitty pieces of overdone squid. The only downside was the presence of zucchini (bleah). I was also served some standard-issue kimchi, and sweetened seaweed, which I didn't care for at all.
The place was crowded at 1pm, and many of the diners around me were having bibimbop, which I will be back to try. The waitresses were very sweet, but they seemed overwhelmed, both by the lunch crush and the fact that they speak exactly enough English to get through an order. Do not try to get them to go off script, as the boorish older man at the next table did by insisting on getting his kimchi before he ordered anything. His waitress smiled warily and walked away. This little dance was repeated several times - she came over, he refused to order until she brought him some kimchi, she left. They may still be at it.
Note that the Menupages menu lists soondooboo with seafood, while the restaurant menu lists soondooboo with fish. But clams/mussels/shrimp/squid (or maybe cuttlefish - I can't tell them apart) is what you get.