I think this will be my first review of a store and not a restaurant, so I'll try to keep it on the mark.
First off, I've just returned from living in Korea for 3 years so my opinion is extremely biased.
I will start with the bad. A lot of previous reviewers felt the prices were very reasonable and I have the unfortunate knowledge of knowing that some of those stationary items have a 100% markup. Ouch. Apparently that's normal and other reviewers were pleased by the prices. If you're ever interested in buying these sorts of products in bulk, I think the GMarket website is a better go.
That being said, the selection is very good and the service is VERY friendly. Not only did they help me find the item I was looking for within my price range, they then individually wrapped each item (it was a pencil case set) so that my gift looked extra bulky. Since coming back to Canada, I haven't run into service as friendly as the one I got in this store. They also chatted with me and were really personable.
I hope this store does well in Toronto because I think they're doing everything right. I would love it if other stores learned from them!