Google Maps API Web Services - Directions API Support Korea?

Hi
I am a Korean Developer

Google Maps API Web Services - Directions API
Does South Korea do not support this API?

ex)
http://maps.google.com/maps/api/directions/xml?origin=%EC%84%9C%EC%9A%B8%EC%8B%9C%20%EA%B0%95%EB%82%A8%EA%B5%AC%20%EC%82%BC%EC%84%B1%EB%8F%99&destination=%EC%84%B1%EB%82%A8%EC%8B%9C%20%EB%B6%84%EB%8B%B9%EA%B5%AC%20%EC%88%98%EB%82%B4%EB%8F%99&mode=walking&sensor=false

result
<?xml version="1.0" encoding="UTF-8"?>
<DirectionsResponse>
<status>ZERO_RESULTS</status>
</DirectionsResponse>

Currently South Korea but I'll support this API?
Help Please~

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