Coffee House will always be one of the dramas that I will remember as laugh out loud funny. 
Modern farmer is funny!
Marriage not dating, bad family
Marriage, not dating
Oh my ghostess, you who came from the stars, rooftop prince, the girl who sees smells
I agree; Oh My Ghostess was really funny. I would also add Reply 1988 and Surplus Mermaid/Princess. 
HANA KIMI ... THE OLD VERSION
Unstoppable High Kick! 
I Hesitate between: Master's sun, You who came from the stars, Hotaru no Hikari and the Greatest love.
OMG in the greatest love I almost died of suffocation when she wore that frog costume!
Cheon Song Yi is my all time favorite hilarious crazy female lead!
My favorite Joo Joong Won quote in Master's sun is of course " KAJA!" loooool and PLEASE the hand movement is everything about it!
Himono-onna...-ness creates hilarious situations in Hotaru. LMFAO

I laughed so much with these, my tummy hurt.
History of a Salaryman and It's Okay, That's Love
Surplus Princess 
You Who Came From  The Stars
The Producers
Surplus Princess
Oh My Ghostness
Naeil's Cantabile
Wild Romance