Best Seoul-like Korean in LA?
Hwae naengmyun is served at dozens of restaurants in Koreatown, including places like Chosun that you wouldn't think would touch it. Hamhung does pretty much specialize in the dish - you may as well give it a try - and although I've never tasted the version at Chilbo, I would imagine it would be as good as the regular naengmyun there, which is superb. Yu Chun has a somewhat different take on the dish - their naengmyun are made from kudzu root - but it is worth tasting.
I would imagine that the higher end seafood places like Masan might have jukkumi during its short season, but I've never seen it here.