4,500 won at Pho Bo in Noryangjin Station area. Broth is ok, they use thick rice noodles. Not a lot of fixings but it works. And for the price you can't go wrong. 

90-8 Noryangjin 1(il)-dong (27 Noryangjin-ro 16-gil)

Dongjak-gu, Seoul

http://goo.gl/maps/I5KZL