The King 2 Hearts (20 Episodes)

Ha Ji Won as Kim Hang Ah
Lee Seung Gi as Lee Jae Ha
Jo Jung Suk as Eun Shi Kyung
Lee Yoon Ji as Lee Jae Shin

http://en.wikipedia.org/wiki/The_King_2_Hearts

Emergency Couple (21 Episodes)

Song Ji Hyo as Oh Jin Hee
Choi Jin Hyuk as Oh Chang Min
Lee Pil Mo as Gook Cheon Soo
Choi Yeo Jin as Shim Ji Hye
Clara as Han Ah Reum

 http://en.wikipedia.org/wiki/Emergency_Couple