To give you example,
my best korean dramas list by far:
My Love From The Stars
To The Beautiful You
Master's Sun (I really liked everything except those scary ghosts xD)
She Was Pretty
But I really liked The Girl Who Sees Smells, Pinocchio, The Heirs.
I haven't finished Flower Boy Next Door but I really like it!
Warm and Cozy, The Time We Were Not In Love, Heartstrings, Love Rain, Prime Minister and I are great too.
I'm watching Oh My Venus and I like it.
I would like to watch korean drama where "There were no evil Moms, nor were there any rich, chaebol ahjussis taking over the whole plot." (copied from Ash review of She Was Pretty because she described) And I don't like Medical dramas because of blood and operations I just can't watch those kind of things and It's sad that "Emergency Couple" and "Faith" is like that kind of drama.
I would like it to be Romantic Comedy, I don't like Melodramas. Also I'm not really into Action, Thriller and dramas where there is bullying (like in Boys Over Flowers and School 2015)
I'm not a fan of historical drama, because of politics, but if there is interesting historical drama without politics, you can recommend me.