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... ;)
My top 10:

1. Jumong and Soseono (Jumong)
2. Lu Bu and Diao Xiao (Three Kingdoms)
3. Ha Do Ya and Seo Hye Rim (Dae Mul)
4. Shim Gun Wook and Jae In (Bad Guy)
5. Eun Chan and Han Kyul (Coffee Prince)
6. Gumiho and Cha Dae Woong ( My Girlfriend is a Gumiho)
7. Kim Yoon Hee and Lee Sun Joon (Sungkyunkwan Scandal)
8. Yi San and Song-Yeon (Yi San)
9. Deok-man and Bidam ( Queen Seon Deok)
10. Jang Geum and Min Jung Ho ( Jewel in the Palace)
Heh!

My top 10 drama couples are.

1. Joo Won & Ra Im (Secret Garden)
2. Dokko Jin & Ae Jung (The Greatest Love)
3. Eun Chan & Han Kyul (Coffee Prince)
4. Gong Chan & Yoo Rin (My Girl)
5. Jo Gook & Mi Rae (City Hall)
6. Do Ya & Hye Rim (Dae Mul)
7. Jason & Pil Sook (Dream High)
8. Jin Hun & Sam Soon (My Name is Kim Sam Soon)
9. Ji Oh & Jun Young (The World That They Live In)
10. Woo Hwan & Eun Sang (Shinning Inheritance)
I have think about this and come back...lol
Mae Ri & Jo Guk (City Hall)
Byung Hee & Chul Su (What's Up Fox)
Eun Chan & Han Kyul (Coffee Prince)
Dokko Jin & Ae Jung (The Greatest Love)
Bo Ri & Tae In (Biscuit Teacher & Star Candy)
Yi Nok & Hong Gil Dong (Hong Gil Dong)
Sam Soon & Jin Hun (My Name is Kim Sam Soon)
Eun Chae & Moo Hyuk (I'm Sorry, I Love You)
Ah Jung & Ki Joon (Lie To Me)
Joon Young & Ji Ho (The World They Live In)
mine:

MGY & JGS in MSOAN (can't remember character names..)
Yi Nok & Hong Gil Dong in HGD
Mae Ri & Jo Guk in City Hall
Eun Chan & Han Kyul in Coffee Prince
Momo & Sumire in Kimi wa Petto
Tsukasa & Tsukushi in HYD
Moon Jae Shin & Song Joong Ki in SKKS (it counts imo XDD)

and many many more... XD
Mine would be ....

1. Domyouji and Makino (Hana Yori Dango)
2. Woo Hwan and Eun Sung (Shining Inheritance)
3. Gu Mi Ho and Cha Dae Woong (My Girlfriend Is A Gumiho)
4. Eun Chan and Han Kyul (Coffee Prince)
5. Joo Won and Gil Ra Im (Secret Garden)
6. Ah Young and Secretary Kim (Secret Garden) - they weren't a main couple but I loved them as on (:

and....I think I'll come back when I finish more dramas :P The other couples I think of wouldn't really be ones I'd put in my top 1O.
1. Joo Won & Ra Im (Secret Garden)
2.Song Sam Dong & Go Hye Mi (Dream High)
3.Kang Bok Gu & Cha Eun Seok (A love to kill)
4.Lee Jin Soo & Seo Eun Young (Coffee House)
5.Yin Xia Mo & Ou Chen (Summer's desire)
6.Amemiya Hotaru & Takano Seiichi (Hotaru no Hikari)
7.Hong Tae-Sung & Moon Jae In (Bad Guy)
8.Gu Mi Ho and Cha Dae Woong (My Girlfriend Is A Gumiho)
9. Bi Dam & Princess Duk Man (Queen Seon Duk)
10. Kim Hyun Joong & Hwang Bo (We Got Married) though is a reality show
I've finally reached a decision regarding my 10th couple: Sae and Kai (Orange Days).

The last one is always the hardest to chose. ;)
Hwan and Eun Sung (Shining Inheritance)
Eun Chan and Han Kyul (Coffee Prince)
Gil Ra Im and Joo Won (Secret Garden)
Ae Jung and Dok Go Jin (Greatest Love)
Mi Nyu and Tae Kyung (You're Beautiful)
Shin and Gyu Won (Heartstrings)
Mika and Hiro (Koizora)
Ah Jung and Ki Joon (Lie to Me)
Asou and Aya (1 Litre of Tears)
Hye Mi and Sam Dong (Dream High)
1.Makino and Doumyouji - Hana Yori Dango
2.Go Mi Nyu/Nam and Tae Kyung - You're Beautiful
3.Eun Chan and Han Kyul - Coffee Prince
4. Ji Hyun and Han Kang - 49 Days
5.Mu Chen and Guan Xi - Atumn's Concerto
6.Xin Yi and Cun Xi - Fated To Love You
7.Ken and Rei - Proposal Daisakusen
8.Mizuki and Sano - Hana Kimi
9. Nodame and Chiaki - Nodame Cantabile
10.Eun Jo and Ki Hoon - Cinderella's Sister
Kim Joo Won & Gil Ra Im (Secret Garden)
Gu Jun Pyo & Geum Jan Di (Boys Before Flowers)
Cha Dong Joo & Bong Woo Ri (Can You Hear My Heart)
Choi Han Kyul & Go Eun Chan (Coffee Prince)
Lee Sun Joon & Kim Yoon Hee (Sungkyunkwan Scandal)
Han Dong Joo & Lee Da Ji (Paradise Farm)
Ah Da Mo & Dan Sa Ran (New Tales of Gisaeng)
Iljimae & Eun Chae (Iljimae)
OSKA & Yoon Seul (Secret Garden)
Jeong Ji Oh & Ju Jun Young (The World That They Live In)
My Top 10 so far------->List may subject to change

1.Kim Nana & Yoon Sung(City HUnter)

2.Joo Won & Gil Ra Im(Secret Garden)

3.Mi Rae & Jo Gook(City Hall)

4.Yong Yon & Yun Jie(Sunny Happiness)

5.Tak Goo & Mi Sun(King Of Baking Tak Goo)

6.Gong Chan & Yoo Rin(My Girl)

7.Hotaru & Seiichi(Hotaru No Hikari)

8.Hye Ri & Seo In Woo(Prosecutor Princess)

9.Sam Soon & Hi Hun(My Name Is Kim Sam Soon)

10. Hikari & Makio(My Boss My Hero)-------->Yes i know they weren't official
buivincent wrote:

10. Hikari & Makio(My Boss My Hero)-------->Yes i know they weren't official


Unofficial couples are often the most intriguing ones. Couples that could have been and had great chemistry.
Like Kurosagi and Tsurara, or So Yi Jung and Chu Ga Eul in BoF (didn't really love the drama, but their storyline was very sweet).
:)
1. Lee Da Hae with Lee Dong Gook (My Girl)
2. Kusanagi Tsuyoshi + Kuroki Meisa (Ninkyo helper)
3. Yamapi and Maki (Nobuta wo Produce)
4 Go Mi Nam with...Shin Woo
5. Lee Pyung Kang with Edward(this didn't happen though =/) (Invincible Lee Pyung Kang)
6. Matsumoto Jun + Inou Mao (Hana Yori Dango)
That's...all I have