does anybody know where I can find Demeter perfume 향수 in Seoul?

I'm getting it as a gift for my teacher - her birthday approaches, and I know she likes that perfume.

I tried the Aekyung department store and they didn't have it there - or at the other makeup/perfume shop in the mall...

does anybody know where I can find it?

 I know there's a big make-up shop in Gangnam with a lot of perfume... and I know Lotte at Jamshil has a lot of perfume... but I don't want to go all the way over to Jamshil if it's not there