Here you can tell which your 5 fav main role (single/couple) from Asian drama... My favorite is: 1. Gil Ra Im & Kim Joo Won (Secret Garden) 2. Se Ryung & Seung Yoo (Princess' Man) 3. Ruo Xi (Bu Bu Jing Xin) 4. Go Eun Chan (Coffee Prince) 5. Lee Soo In & Kim Hyun Woo (Love Story in Harvard)
1. Kim Joo Won (Secret Garden) 2. Kim Sam Soon (My Name is Kim Sam Soon) 3. Gu Mi Ho (My Girlfriend is a Gumiho) 4. Nakahara Sunako (Yamato Nadeshiko Shichi Henge) 5. Aizawa Airu (Love Shuffle)
1.Cheol-su (A Werewolf Boy) 2.Go Nam Soon & Park Heung Soo (School 2013) 3.Ren (Ikemen Desu Ne) 4.Goo Yong Ha/Yeorim (Sungkyunkwan Scandal) 5.Yong-ee (Iljimae)
1. Hiro & Mika (Koizora) 2. Mi Nam (You're beautiful) 3. Ruo Xi (Startling by Each Step) 4. SiWon (Reply 1997) 5. Eun Sung (Shining Inheritance)
In no particular order:
1. Cha Dong Joo (Can You Hear My Heart)
2. Go Eun Chan (Coffee Prince)
3. Lee Dong Chul (East of Eden)
4. Kim Sam Soon (My Name Is Kim Sam Soon)
5. Kang Hyun Min (The King of Dramas)
Kang Maru & Eun Gi -Innocent Man
Tian Qi & Ah Xing- My Lucky Star
Eun Seol & Ji Heon- Protect The Boss
Nao & Shinichi- LIAR GAME
Enrique- Flower Boy Next Door
ohh there are soo many good ones but my fav fav favs are - 1. lee yoon sung - city hunter 2. goo majun - king of baking kim tak goo 3. lee shin - goong 4. lee kangto - bridal mask 5. cha dong joo - can you hear my heart
I love this topic<3

Kdrama - no specific order beside the first place

1.Bi Dam & Mi Shil(Queen Seon Duk)
2.Seo Na Yoon (Protect the Boss)
3.Lee Shin & Shin Chaegyung (Goong)
4.Kang Ma Roo (Innocent Man)
5.Park Cheol Soo & Byung Hee (What's up Fox?)

Jdrama - no specific order beside the first place

1.Yamaguchi Kumiko (Gokusen)
2.Akiyama Shinichi (Liar Game)
3.Domyoji Tsukasa & Nishikado Sojiro (Hana Yori Dango)
4.Kanzaki Hiroto & Tsukioka Nao (Tatta Hitotsu no Koi)
5.Tokita Shuntaro & Nitta Teru (Lucky Seven)

Cdrama - no specific order beside the first place

1.Li Ge Xiao & Yan San Niang (The Vigilantes in Masks)
2.Chen Ling (MARS)
3.Jiang Meng (Devil Beside You)
4.Yuan Xiang Qin & Jiang Zhi Shu (ISWAK & TKA)
5.Chen Xin Yi (Fated to love you)
In no particular order! 1. Nakatsu (hanakimi) 2. Akiyama Shinichi (Liar Game) 3. Nobuta, Akira and Shuiji (Nobuta wo produce) 4. Kang Jun Hee (Reply 1997) 5. Byung Hee (Shut up flower boy band)
1. Kim Boong Do (Queen In Hyun's Man) 2. King Sejong (Tree with Deep Roots, as played by both Song Joong Ki and Han Suk Kyu) 3. Lee Jae Ha and Kim Hang Ah (King2Hearts) 4. Kim Eun Oh and Arang (Arang and the Magistrate) 5. Min Tae Yeon (Vampire Prosecutor 1 and 2) Honorable Mention - Bi Dam (Queen Seon Duk), Seo Jang Geum (Dae Jang Geum), Eun Si Kyung (King2Hearts), Hong Gil Dong (Hong Gil Dong), Baek Yeo Chi (Salaryman), Enrique & Go Dok Mi (Flower Boy Next Door), and so far Oh Soo (That Winter the Wind Blows)
1. Prince Shin (Princess Hours) 2. Yoon Yoon Jae (Reply 1997) 3. Goo Jae Hee and Kang Tae Joon (To the Beautiful You) 4. Go Mi Nam and Han Tae Kyung (You're Beautiful) 5. Do Hak Chan (Reply 1997)
This was a lot harder than I'd have thought :p 1. Kim Boong Do from Queen In Hyun's Man 2. Jung Woo from I Miss You 3. Go Yong Ha from Sungkyunkwan Scandal 4. Mi Ho from My Girlfriend is a Gumiho 5. Yoon Sung - City Hunter
1-kang on yu aka jeremy (you're beautiful) 2-kang ma roo (innocent man or nice guy) 3-Bem (Youkai nigen bem) 4-Mr. Brain 5-Hong Gil Dong
1- Lee Min Ho as Gu jun pyo 2- Show Lou as Xue Hai / Lin Da Lang from Hi my sweetheart 3- Lee Jun Ki from Iljimae 4- Chen Ivy from Skip beat 5- Ariel Lin from ISWAK
For me, in no particular order since they're all so WOW! And it's couples since they had so much chemistry together I couldn't break them apart! XD Also, some of the choices may seem strange, but remember I haven't watched that many dramas so far so the choices come from the dramas that I have watched so far!

K-Drama:
- Jang Geun Suk & Park Shin Hye // Hwang Tae Kyung & Go Mi Nyu (You're Beautiful)
- Park Yoochun & Han Ji Min // Lee Gak & Park Ha (Rooftop Prince)
- Yoon Shi Yoon & Park Shin Hye // Enrique Geum & Go Dok Mi (Flower Boy Next Door)
- Lee Dong Gun & Han Ji Hye // Kwon Hyeok Jun & Yoon Jung Sook (Sweet 18)

T-Drama:
- Joe Cheng & Ariel Lin // (ISWAK & TKA)
- Mike He & Rainie Yang // Jiang Meng & Qi Yue (Devil Beside You)
- Jerry Yan & Ella Chen // Xiang Yu Ping & Yang Guo (Down With Love)
- Nicholas Teo & Cyndi Wang // He Qun & Cheng Xiao Shi (Smiling Pasta)
- Ethan Ruan & Joe Chen // Ji Cun Xhi & Chen Xin Yi (Fated to Love You)

C-Drama:
- Alec Su & Jang Na Ra // Zhu Yun & Situ Jing (My Bratty Princess)

J-Drama:
- Tamaki Hiroshi & Ueno Juri // Noda Megumi & Chiaki Shinichi (Nodame Cantabile)
- Tamamori Yuta & Takimoto Miori // Katsuragi Ren & Sakuraba Miko (Ikemen Desu Ne)

Unfortunately they're the only couples that I really liked in the dramas I watched - sorry it's not top 5 for every country's drama ^^ll