Korean is certainly not the only language in Flushing, but it is well represented. Take the 7 train to the end of the line in Queens and you will see a ton of Korean.
This neighborhood is home to a large Korean population. Walking around, I passed Korean grocery stores, Korean delis, Korean beauty salons, a Korean newspaper, Korean language schools, Korean law firms, Korean gyms, and almost any other kind of business you could imagine.
Korean signs were everywhere!