I think there's probably a big difference in Koreans say in GA vs Koreans in CA...
I looked at early voting for the 2016 primary, it seems like 50-60% of Koreans voted in the D primary, whereas for California, it's probably more like 75%.
Georgia being an open primary and California being closed for Republicans might have an impact on this, though. Some Asian-Americans in Georgia might have opted for the Republican primary for vote against Trump (for Rubio), but they were unable to do so in California (and the Republican primary is already over anyway).
Where did you get this information?