From 1 May 2012 the UK Border Agency in South Korea is introducing a priority visa service.
The priority visa service is available to customers who pay an additional fee to have their visa application placed at the front of the queue. Under normal circumstances, a priority service visa application will be processed within 3-4 working days.
For more information about this service and whether you meet the criteria please visit the Additional services page on this website.
http://www.ukba.homeoffice.gov.uk/sitecontent/newsarticles/2012/april/64-priority-service-korea