Keyboard Shops in Korea

Hello, this is my first post on this forum. I hope I can meet some nice people on here. I also am trying to study korean but I'm not very good. I really like keyboards and playing video games.
안녕하세요, 만나서 반갑습니다. 한국어 초보 입니다.  게임 좋아요 그리고 키보드 좋아요. I know this is is english forum but I just wanted to introduce myself in korean as well because I know I cannot do it well on korean only forum. 

Recently during the summer I went to summer school in 속명대학교 (Sookmyung Women's University). No I'm not female haha. I went to Najin Electro World in Yongsan. I bought this keyboard. It's called a Mstone Groove87 FR-4. It's basically like a Cooler Master QFR keyboard. 

I was wondering if there were any good shops in Korea that have good keyboards. I was planning to go there again during the winter. I asked some of my friends last time I went but they didn't know much about keyboards. So I think it would be really helpful asking you all here. Thank you 감사합니다!