Hi where can i buy a used mobile/cellphone here in busan?
I hope this information , can help you ^^
Not sure about the areas you mentioned but there used to be several shops selling used phones in the Seomyeon underground shopping mall. I haven't taken a walk there for about 18months, so may not be there anymore.
Or if you check the classifieds on this site people are selling their phones all the time.
Warm up this winter
with your bright Vision
BGN Eye Hospital
ReLEx SMILE / LASIK / LASEK / ICL