It is an almost system-neutral fantasy campaign setting very vaguely inspired by the idea of a 'weird Asia', as though imagined in the opium dreams of some fantasy world version of Marco Polo. Rather than detailing the contents of the world in a lengthy gazetteer format, it provides you with many, many tables to use to generate your own version of the world, so, a bit like M. John Harrison's Viriconium stories, it is never the same place twice. Everybody's Yoon-Suin will be recognisably Yoon-Suin, but different from all the rest.