We stopped by Kayagum out of convenience and everything about our experience here was subpar. The restaurant was quite empty yet it still took us a while to get seated and flag down a waiter to take our order. The restaurant staff didn't seem able to handle just a few tables.
The food here is only okay. I had the Salmon Bibimbap and the salmon was decent, but the rest tasted really plain.
I guess this is a good spot to get something late at night since it's open 24/7, but don't expect great food.