You should go to any Samsung Service Centre in Korea.
Centres are placed throught out capitals. (mostly in Seoul)
You can find the nearest centre from the website:
http://gis.samsungsvc.co.kr/You may need a help from Korean speaker since English is not available.
Or you can ask where it is at 02-1330(Tour information centre, service is available in English)
Hope you enjoy everything in Korea.