There's various types of haejangguk - you wouldn't even think they'd have anything in common beside that they contain hot liquid.  First kind I had had dried pollack and not much else - thin, bland and uninteresting.  Just the restaurant I guess, 'cause I've had better pollack haejangguk since.  There's bbyeo haejangguk - that's something similar to kamjatang, but maybe without the potatos - big spine bones in soup.  Another kinds uses a lot of spinach.  Then there's the pork blood kind.  And a kind that focuses on having lots of soybean sprouts. Probably more I've missed....  There's a street in Jongno, in Seoul, that has some famous drinking establishments.  The next street over has famous haejangguk restaurants - conveniently located! -phage-