Just heard about an odd announcement on Facebook -- looks like the magazine Rokon is having a farewell party on June 27 at Sortino's in Itaewon. Does that mean Rokon is no more?
Seoul has several free English-language magazines -- ROKON, GROOVE, and ELOQUENCE (not to mention one not-so-free magazine, SEOUL). While Rokon was definitely the prettiest of the freebies, it was not exactly a fountain of music news or cultural insight. Probably for the best that the few people writing useful articles move over to the remaining mags and try to make something more substantial.
The history of English-language 'zines and publications in Korea is a sad but long one. The best way to learn about it is to pick up a copy of J. Scott Burgeson's book KOREA BUG, which has a great 70-page essay about English-language publications in Korea, from Ernest T. Bethell's KOREAN DAILY NEWS to Skunk Hell's BROKE IN SEOUL.
For an overview of more recent indie publications, like K-SCENE and ROKON, Scott has another essay here.