I'm not too sure about anything like "Chasing Liberty", which I really liked by the way, but I know two that had semi-reluctant social climbing? Where they are scared of the popularity/responsibility of a higher status. :/ If you find any closer to "Chasing Liberty", you should let me know too!!
-Semi-Reluctant social climbers-
"Romantic Princess" - Taiwanese drama
"My Princess" - Korean drama
-My Favorite Romances-
"Secret Garden" - Classic on all counts.
"Queen In-Hyun's Man" - A MUST see for romance.
"King 2 Hearts" - Romance with political aspects.
"You're Beautiful" - My first drama love. <3
"Smiling Pasta" - This is a Taiwanese drama, and is just utterly adorable. It is light and fluffy, but so well done. If you need to smile, watch this!
"Coffee Prince"
Those are the most romance orientated dramas I have on my list. Well, "King 2 Hearts" might not be as light as you want, but I couldn't bare to leave it out. XD Hope this helped!