Most of those sites offer ebooks as well while others might require you to use some sort of shipping proxy or w/e. (Again I feel like there should be something like a fans-for-fans-proxy-community to make things easier ._. )
Also amazon.com and amazon.jp might be good places to look at for both Korean manhwas and anime.
For anime: http://www.yesasia.com/us/en/korean-anime.html
I hope this helps you! :)
Buying resources out of their own pockets, spending energy and effort, with almost no return so that everyone can enjoy the cultural and entertainment products of developed countries at almost zero cost walking in the dark to serve the light, they are real heroes