Last time I visited Manrijansung was with my friend and we both decided to order Tangsuyuk and jajangmyeon as the restaurant is a chinese (Korean version) restaurant. They also offer non chinese-korean dishes, so in case you are looking for kalbi or bulgogi they also offer those dishes.
The atmosphere of the restaurant wasn't too bad, but it felt a bit stuffy and dusty. The walls definitely needed a nice scrubbing when we went to visit.
Also, there is a button on your table that you can push to have a server come to your table. This is quite common in Korea and some other Korean restaurants and Karaoke bars in Calgary have it too.
As for the food, the Tangsuyuk was not too bad, but I prefer Korean Village's Tangsuyuk better. Also their jajangmyeon wasn't too bad as well, a bit runny, but not too bad.
Overall, I probably would come and have lunch there again if my friends wanted to. And if we were already downtown and nearby. But I wouldn't drive down and spend parking to have lunch in Manrijansung.