I am well aware this must be the most common, trite question on forums, but when I think back at some of the dramas I loved the most, couples always come to my mind.
So, please forgive me for being so mundane. :)
Here are my top 10:
1. Joo Won and Ra Im (Secret Garden)
2. Nao and Hiroto (Tatta Hitotsu no Koi)
3. Daoming Si and Shan Cai (Meteor Garden)
4. Nao-chan and Akiyama-san (Liar Game. Not a romantic couple per se, but with tons of potential to be)
5. Noriko and Yuka (Long Love Letter)
6. Ren Guang Xi and Mu Chen (Autumn's Concerto)
7. Aki and Haru (Pride)
8. Eun Chan and Han Kyul (Coffee Prince)
9. Ojiro and Kairi (Love Shuffle)
10. ...
I need to leave the 10th blank, because I'm sure I've forgotten a great couple somewhere... ;)