Go Ho's Starry Night. It's short, cute, full of fluffy moments and makes you laugh a lot.
Weightlifting Fairy KBJ is very light and fluffy, too.
Other options:
Let's Eat 2
You're Beautiful - some drama in the meantime, but pretty short-lived
Sassy Go Go
I also liked Ex Girlfriend's Club and High End Crush, but they not many people seem to have seen them, so I don't know if they're popular
I'm currently watching Good Morning Call (jdrama) and My Mr. Mermaid (cdrama). Both of them seem cute and full of adorable moments.