All I know are some really old Japanese ones that I used to like:
GTO (90's one w/ Sorimachi Takashi)
Whatever that hockey one was with Kimura Takuya.
The Hours of my life.
No Dropping out- Back to school at 35-
Boys over Flowers.
and many more.
Liar Game (based on a manga)
Soshite Dare mo Inaku Natta
Pinocchio and Kill me, Heal me
Mischievous Kiss: Love in Tokyo is a really cute and funny one.
The Wallflower is another good one. Both are J-Dramas
Age of youth is pretty interesting
the k2 was pretty good as well
potato star was really funny too^^
BOI MY KDRAMA RECOMMENDATION LIST IS FOUND HERE
you can watch them all on dramafever.com
Modern Farmers And Drinking Solo are pretty freakin' awesome *___*
I personally love the J-Drama Itazura Na Kiss -Love in Tokyo. It has 2 seasons (I kinda like the second one more though) and is based off of an anime series with the same title. I don't know if there's a manga of it too or not. It's really cute. :)
As for K-Dramas I recommend Nightmare Teacher, Sassy Go Go, Who are you - School 2015, Personal Taste and Flower Boy Next Door. There are many more I recommend but that would be too long of a list.