Buying Plarail in Seoul, South Korea

Hello there, I am about to have a small holiday to Seoul, South Korea in about a month or so, for the Lunar New Year.

I am wondering if there's any place in Seoul that I can buy Plarail train and sets from? SK is close to Japan so I hope that Seoul would have more up-to-date Plarail trains than what I have here. Any place in Seoul would suffice, and, if Lotte World has one, please give me exact shop location inside there.

Thank you all very much!