The Hakka have origins in northern China and over the centuries they migrated all the way across China (those with caucasian features were persecuted and slaughtered on the way) mainly into Guandong province but also to Japan, Korea, Taiwan and today, all over the world. To this day, they are referred to as the 'guests.' My local Chinese restaurant owner was shocked when I asked her if she was Hakka and when she said "yes", I said, "Ah "the guests." We're pretty good friends now, lol.
LOL! Do you have any links to pictures of Hakka? I'd like to see what they look like compared to other Chinese.