This is hard. Other than my first place, the rest aren't necessarily in order.
1. Han Qi Luo and Chen Ling (MARS) Love, love, love this couple! <3
2. Kim Joo Won and Gil Ra Im (Secret Garden)
3. OSKA and Yoon Seul (Secret Garden)
4. Han Kang and Shin Ji Hyun (49 Days)
5. Sakurai Hiroki and Tahara Mika (Koizora)
6. Akiyama Shinichi and Kanzaki Nao (Liar Game) They should've done more with them. The chemistry was there!
7. Domyoji Tsukasa and Makino Tsukushi (Hana Yori Dango)/Dao Ming Si and Shan Cai (Meteor Garden)
8. Kanzaki Hiroto and Tsukioka Nao (Tatta Hitotsu no Koi)
9. Nakatsu Shuichi and Ashiya Mizuki (Hana Kimi) This should've happened...
10. Takano Kyohei and Nakahara Sunako (Yamato Nadeshiko Shichi Henge)
Honorable Mentions:
Usami Kei and Aizawa Airu (Love Shuffle), Hanzawa Naoki and Hanzawa Hana (Hanzawa Naoki), Asamoto Soshi and Izawa Riiko (Zettai Kareshi), Lee Yoon Sung and Kim Na Na (City Hunter), Sawada Shin and Yankumi (Gokusen), and Goo Yong Ha and Moon Jae Shin (Sungkyunkwan Scandal) Yes I'm crazy, I know. Oh, and one last one: Song Ji Hyo and Kang Gary (Running Man) I gotta love my favorite variety Monday Couple! <3