If the said implant company has USA-FDA, Korean FDA, ISO approval and if it stands in Korean good manufacturing company list then i don't see any problem going for this. You also need to find out who is doing the implant surgery and how expert he or she is.
Try Implantium by: Anonymous
There is a really good korean system called Implantium. This is available in the UK. Ask your dentist for this. Or contact ww.implantiumnetwork.co.uk