This is, without doubt, one of my favorite shops. I used to have one in Spain near the Korean area, and loved buying color pens and cute notebooks and stickers there. The shop closed and I also grew up, so I kind of forgot it. However, after coming to Korea, I saw a branch near my house again, and got so happy to see they have so much more things here!
They have their own character too, but in Korea they seem to have faded away.
You can buy anything from pencils, notebooks, scissors, arts&crafts; here, and in bigger shops also plushies, fashion, cute detail gifts, etc. I also get birthday cards here often.