Ganadara is the best place for Korean food in Montreal. While there is always a line-up, it is definitely worth it. If you come alone or as a couple, the wait shouldn't be too bad, but groups of 3 or more need to be patient. However, once seated, you get your food very quickly and service is overall great. Prices are super reasonable and they have an alcohol licence. I recommend taking about 3 plates for 2 people. Only downside is the place could be bigger!
My personal favourites are the tteokbokki (they have a crazy cheese version) and the bulgogi kimbap!