Went to a good place for Mandoo Guk (만두국) today with my wife, near her workplace.
합흥에 겨울냉면 has really good Mandoo Guk with huge, tasty mandoo for W7,000, but the Nangmyun (in the restaurant’s name) is not very good, at least the bibim nangmyun.

It’s a short walk from Danguk University station (line 3). I can’t remember the exit number, but it’s the exit next to #1 (should be #2, but not sure). Walk about 300 meters and it’s on the left side.