Kdrama and Crunchyroll are free channels in the channel store with free content.
Crunchyroll focuses on Anime cartoons, but a search for title pulls up many Korean dramsa.
KDrama has many listings for Korean dramas but the Search function pulls up more that aren't listed or have been dropped from the icon listing.
They are both free, and have English subtitles.
The "dramas" are typically quite innocent romantic soap operas with lot's of crying, love trianges, family tension and secrecy. They are usually funny with exaggerated acting, with moral messages.
Stars are often ex-singers and models about 22 years old, and a few parents and grandparents tossed in.
Photography is usually excellent, and video quality varies, but far short of HD. Many series are in the 4:3 box format, but occasionally throw in a few 16:9 wide format shows.
I'm an "old guy" who would NEVER watch an American soap opera, but I got hooked on these, so I watch one per night.
Warning: they are typically 17 or so one-hour episodes, but one was 57 hours and KDrama stopped listing it toward the end, and I panicked. But then I did a search each time for these series I got to finish the last 7 episodes!
Wikipedia has a large entry on korean drama, and fan sites allow plenty of exploration by title and star.
HuluPlus is a subscription service that I don't use.