Korean Dramas are comparable in content and format to Japanese, Hong Kong and other Asian dramas. They typically run for one season. Aimed at women with focus on romance, family and, well, drama, Korean dramas (along with music and movies) have been sweeping over Asia for the last decade in a phenomenon called the 'Korean Wave' or Hallyu
Some Korean dramas are popular enough to get remade in other countries - Winter Sonata
was so popular in Japan a Japanese version was produced. The street runs both ways, too, as the immensely popular Hana Yori Dango
was made into a Korean drama as well
(not to mention a Taiwan drama and a Chinese drama).
Korean dramas are famous for the female lead inevitably having to deal with a vicious mother-in-law
, tragic setbacks and someone falling terminally ill. Actually, they're famous for pretty much everything
Here is a guide
on how to write a Korean Drama (Under Construction)
It also has a wiki
(which is for Asian dramas in general).