Unless specified, they are Korean. I'll specify if it is Japanese or Chinese in case of a different one. 

With happy endings

Dramas that don't have a happy ending. Ratings indicate I've watched them despite the non-happy endings, and some of the not so happy ending…

Only happy ending dramas  - in order to remember what I have watched and what I enjoyed. Many of the dramas do NOT end with a Wedding, but…

Too sad, very heartbreaking

Shows or movies that regardless the ending, they are worth watching at least once.