Zusun

From: 1122shadows
Baek Mu-gyui falls in love with the daughter of his enemy, Maehwa. Together they leave behind their clans only to find that war has broken out since their departure. Hoping to end this war, they return together and find themselves in a battle for power over a mystical sword.
Webcomic from Daum.
Please address this work as a Manhwa. (Korean word for cartoon)
http://cartoon.media.daum.net/webtoon/view/zusun