dramas:  padam padam, chuno, shine or go crazy
movies:  Late Autumn and A Man and a Woman
Stairway to heaven

Runner up:
Autumn Tale
Please come back mister
Marry him if you dare
Top Spot: Queen Seon Duk
Runner up: Empress Ki, 49 Days
Moon Lovers: Scarlet Heart Ryeo 

Seriously needs a second season!!!! >
Cruel City
49 days
Hello, God
Gaksital
Hong Gil Dong
War of the Sons
Moon Lovers: Scarlet Heart Ryeo
Empress Ki
I Remember You
If we're talking about dramas without a happy ending then SCARLET HEART IS DEFINITELY AMONG THE LIST
East of Eden
Warrior Beak Dong Soo
Boku No Ita Jikan
also c drama Ice Fantasy
Moon Lovers: Scarlet Heart Ryeo...
The Guardians (a.k.a. Lookout) its REALLY good.
Uncontrollably Found - it makes more sad that woo bin is really sick
Missing Noir M
Uncontrollably Fond
Moon Lovers: Scarlet Heart Ryeo
I agree with Scarlet Hearth, thought I actually didn't mind the ending too much.
On the way to the airport had kind of satisfactory ending, but I wouldn't call it a happy ending. I really liked the drama, too.