Four: Greek

This cast is just so amazing. Each and every member of it. Every episode made me laugh, or cry, and when one of the characters was hurting, I felt their hurt. These actors are incredibly talented and it's such a beautiful cast.
Couple I ship the hardest: Casey/Cappie
Couple I ship the least: Casey/Evan and Frannie/Evan

(full list of cast members: imdb/Greek)