(I admit that I like a little dramatic touch to my dramas as long as it is well delivered and brings out the character's essence more)
There are many that I like but they are universally famous so I won't mention all.
Crime - Bad Guys and Lookout are my favourites - Though action and story are well-written, what really got me was the way they first portrayed their protagonists in the beginning and slowly showed their various sides.. No one is ever completely good or bad, what matters is which out weighs the other in their choices and what were the situations that made these people make those choices.
Bridal Mask - It is slow, belongs to a unique and not very catchy period that is neither modern nor of kings and queens, might even get tired of some things or people in the drama, but I will never forget it for one reason and one reason only. The way they portrayed the two main guys in the beginning - how they seem like they will be the ones to beat their stereotypical existence but in the end, their paths inevitably become the exact same ones taken by people before them. I can talk abt these characters all day long so I won't.
The following I can't not mention but I won't elaborate on them - Healer, Love in the Moonlight, DOTS, Weightlifting Fairy KBJ, While You Were Sleeping and Goblin