I went to a very good naengmyon place in Koreatown recently. It's called Yun baksa-ne and it's located on 473 Western. My overall rating for their naengmyon is B+. The noodles were almost the right toughness and the broth was quite good on the whole. When I went they served piping hot potato pancakes, which were quite good and a very nice accompaniment.
This place rates much higher than the much heralded Hamhung restaurant on 8th, whose naengmyon was very very disappointing when I went last year. Also, Tom Armitage very kindly brought our attention to an article on places in Koreatown in the LA Times food section a number of months ago. The article was pretty helpful, but the writer mixed in some decidedly mediocre resaturants with some good ones. In it was a reference to another well-regarded naengmyon place, Kangso myonok (I believe on 6th), where the naengmyon is only slightly better than Hamhung's. Finally, I went to a place in Garden Grove that shares Hamhung's name and reputation but sadly found that their bowl of noodles was worst of all.
My search last summer for a good bowl of naengmyon ended in profound failure, but with the weather heating up and my lucky visit to Yun baksa-ne I'm going to resume the search with renewed hope. The next place I'm going to check out is Nul bom on 6th just west of Western. Has anyone been there?