Few fiction writers have worked as tirelessly to subvert stereotypes about “Orientals” as the Korean American Don Lee. The protagonists in his debut, the 2001 story collection “Yellow,” range in ethnicity (from Korean to Japanese to Chinese) and occupation (from professional elites to mad poets), suggesting the heterogeneity of contemporary Asian American life. Lee’s novels, whether about Asian spies in 1980s Japan (“Country of Origin”) or bohemian Asian artists in Cambridge, Mass. (“The Collective”), also span a broad spectrum. But the organizing conceit of all his fiction has remained consistent: Asian Americans are not monoliths.