Okay friends.

I am in need of happy romance dramas. I keep watching too many dark ones and my heart needs a break. (High school related dramas are also much appreciated) I think my heart is getting tired of me screaming at my laptop every episode. 

From your lkst:

Hana Kimi Taiwan
Abbsolute Boyfriend
Itazura na Kiss Love In Tokyo
Monstar
You're already watching this but Sassy Go Go
Oh, My Venus
Ma Boy [web drama]
Beautiful Love [Japanese/Korean collaboration, web drama]
Boss & Me [Chinese]
Ugly Duckling: Perfect Match [Thai]

These are all on the light side for angst, if they have any at all. 
If you're looking for something totally fun, relaxing and cute, I 2nd the rec for Boss & Me.
Adolescence Medley (it's a short 4 episode drama with comedy and  romance)
Marriage, not Dating
Reply 1988
Sassy Go Go
If you like SU,FBB then you might like Heartstrings.
Splash Splash love although far too short.
Smile,you is brill although on the long side it's worth every episode.
Greatest Love

There are loads though haha
I second Splash Splash Love! 

Maybe try You're Beautiful. 
Splash Splash Love was how I recovered after Bad Guys lol

My Girl
Marriage not Dating (its been recommended few times now but for good reason)
Full House Thai
My Girlfriend is A Gumiho
She was Pretty
I Hear Your Voice

J dramas might be nice idea because they can be more light and funny than Korean ones
Nobuta wa Produce

One More Happy Ending - defiinitely!
Gentleman's Dignity
The Greatest Love
Coffee Prince