for the time being, the top three worst dramas I've seen are

1. hapimari: happy marriage!?
2. playful kiss
3. pretty man / bel ami
# Playful Kiss
# Personal Taste
# Leh Ratree
Dropped: 

1. Medical Top Team: I tried but no, bored the hell outta me.
2. Orange Marmalade: Tried for Yeo Jin Goo but I can't finish no matter how hard I try
3. Hi School Love On: Maybe because I don't really like high school dramas, but it started really good but then after a while it became boring and frustrating.

Finished:
1. Goodbye Mr. Black (can't even remember most of it)
2. Cinderella and the Four Knights (nothing new, boring, frustrating)
3. Mary Stayed Out All Night (whyyyy)
Heartstrings   Playful kiss  To the beautiful you
1. Playful Kiss.
2. Pretty Man.
3. Marry Him If You Dare.
they was the worst dramas ever! ????
1. W
2. Cinderella and the Four Knights 
3. Doctors crush
1.W
2.City hunter
3.Secret garden
Run, don't walk, away from these 3 kdramas:
  1. Secret Investigation Record - It's not a secret that it has super low production value. Don't waste your time investigating it.
  2. Inspiring Generation - There was zip that was inspiring about this story.
  3. Uncontrollably Fond - No one was fond of anyone and they were all uncontrollable.
From the series I have been watching (which are not a lot btw), I think these were the worst.

1: The Village: Achiara's Secret (KR) - a failed attempt to create horror, too predictable and useless sidestories
2: Captain of Destiny (HKG) - Bad graphics and a very very basic story.
3: .........
1. Bel Ami
2. Devil Beside You
3. Panda And Hedgehog
1. Another Miss Oh
2. Boss & Me
3. Faith 
1. Love Rain (Just plain boring)
2. Doctor Crush (Couldn't handle all of those cheesiness lol)
3. Reply 1994 (I just watched one episode, but it bored me)
For me, it's honestly Mirae's Choice, Heartstrings and Bel Ami. I hated those so much, such a waste of time.
The Heirs
Moorim school
K2
Wow I liked a lot of the dramas people mentioned...now I'm gonna wander off and feel ashamed of myself :D  Playful kiss and Faith got me into kdrama...although now I realize playful kiss is kinda crap...sooo....

honestly kinda not into boys over flowers or you're beautiful...dropped pretty man too....