Wireless frequencies in South Korea:

Can anyone tell me what wireless frequencies are used in South Korea. We 
asked for Audio Technica 4000 series wireless systems to be used with 
our mics, but they rented Sure U-4D systems. Our systems are set up to 
run between 655.500 and 680.375 MHz.

Now we're considering taking our own stuff. We did it a few years ago 
and had no problems. But, we're concerned about treading on illegal 
territory. Any advice would be appreciated.

Thanks,
-Denny Strauser