1) Boys Over Flowers
2) Marriage, Not Dating
3) Triangle
Probably one of the top 3 dramas that people loved but I hated:
1.) My love from the stars
2.) Boys over Flowers (Korean Version I loved the Japanese version)
3.) Descendants of the Sun.
Dots
Cinderella's four knights
Moonlight in the Cloud 
i have a list :  

to the beautiful you
my girlfriend is nine tailed fox
a gentleman's diginty 
secret love affair
playful kiss
emergency couple
good doctor
sungkyunkwan scandal
heard it through the grapevine
que sera sera
padam padam 
city hall

Atashinchi no Danshi
My Princess
Personal Taste
secret garden
boys over flowers
Mary Stayed Out All Night
To the beautiful you (I wanted to die)
high society (loved the second couple though)
Secret Garden ( why is this popular again?)

1. Boys over Flowers

2. Cinderella and the four knights

3.Who Are You: School 2015

Although there are more in my dropped list that are probably worse than 2 of these, i didn't finish them so i don't feel competent to judge them.

3. Ice Fantasy
2. Missing You
1. Second Love

1. To the Beautiful You  2. Secret Garden  3. You're beautiful