As far as I know, this is the go-to Korean grocery store down town.
If you compare with the suburban Korean stores, it does fall short in terms of prices, freshness, selection...everything. But if you're living in Toronto with no car, this is as good a choice as any. Well, more like the only choice.
This store does not have a fresh fish counter, so if you want fish, it's the tank freezer for you. It does have a good butcher counter. They will even unpackage and repackage meats for you, if you want a different quantity. These are quite good in quality.
Some of the produce is cheapest here, tomatoes and avocados, for sure. For some other produce, check out Bloor Fruit Market across the intersection.
They do have a points program which amounts to something like $20 per $500 spent in the store. The points program and the flyer are often only offered in Korean-speaking format, so if you are not Korean-speaking, and still want to be treated as a first-class citizen, you better be proactive, and ask about it.
The store also rents space out to a few other small businesses, I think a makeup store (Charmzone), a health food store (red ginseng, etc), a shipping store and, my favourite, the fishcake store (Kevin's Taiyaki!).
If you ever wanted to see 30 different brands of soy sauce, this is the place to see it.
As a discarded daughter of the Richmond Hill/Markham/North York persuasion, this place does leave a bit to be desired, but it could definitely be much worse.