Viki is an app which allows you to watch tv from around the world. Though I may be incorrect in saying this, I believe most of the shows on the app are of South Korea. The shows subtitled into many different languages and are shown in high quality.
Not only do they show tv series, but also fact files on actors, (lifestyle) news articles and works the actors have been in which are available to watch on Viki.
Half the joy is watching a show with comments written in real-time by other audiences, as at the peak of episodes, their reaction is priceless (eg. The tension before the classic K Drama kiss scenes, watch the comments blow up and blur across the top of the screen).
(Scholar Who Walks the Night)