If you are only marrying a Korean women based off of Kpop/K-drama beliefs or just because they're Korean. Get prepared for a failed marriage. If you have a strong desire to marry a Korean woman, at least get to know her first. Then ask yourself why you want to marry a Korean woman.
I considered it at one point, but after meeting/friends/dating/etc.,. I think the biggest issue is future goals and cultural differences. I'm learning Korean and want to live in Korea, so for me dating one is ideal. As far as marriage goes, I don't care if she's married or not.