Worst KDRAMA You've Ever Watched?

There are many that I hated but dropped. The worst of the dropped ones are East Of Eden and Mackrel Run. 

Two stand out as terrible, though, that I actually forced myself to complete for who knows what reason. >_< They are: Flower Boy Ramyun shop and Cheongdamdong Alice. The first was so stupid I felt like I lost a few brain cells while I watched. I loved the other two Flower Boy installments, but FBRS was terrible! 

Cheongdamdong Alice pissed me off the entire way through. I hated everything about that drama with the exception of Park Shi Hoo. He was hilarious. Everything else, everybody else, was selfish, spoiled and totally unlikable.

Out of the Kdrama's I've completed, it's My Secret Hotel.
Out of the Kdrama's I've dropped, it's Heirs.

PLAYFUL KISS (watched it, but did not like it too much)
I HEAR YOUR VOICE (everyone watched it and loved it, for me this one I dropped it half way, tried 3x to watch it again, but cast and whatever it was - it never got me, honestly not sure if I try to watch it again anyway)
MARY STAYED OUT OF THE NIGHT ( finished it but not planning to watch it again, for me chemistry did not work, and somehow the drama did not have any effect on me, did not learn much, did not like the ending too much although she picked one from both guys plus somehow the acting was just ok, nothing to remember for me)
FULL HOUSE (Original one, it was boring for me, plus I found it noisy - too much screeming) I loved THAI VERSION - it was romantic and honestly, I never knew Ice cream looked so sexy LOL) Full House 2 was ok too, but Thai was spectacular!

Athena Godess of war
Birth of a beauty
Heirs
Surplus Princess
Secret Hotel

Mary Stayed Out All Night - I dropped it at episode 14 because by that point I didn't care what happened to any of them. The girl annoyed me, there was WAY too much back and forth and WAY too many dumb misunderstandings. I also feel like Jang Geunsuk plays the same character over and over again. You're a brooding musician. We get it.

Marry Him If You Dare - for something I actually completed. What a (boring) mess.

From what I've dropped... There are so many bad ones that I'm having hard time choosing. The Heirs? Bride of the Century? Nail Shop Paris?

You know you cannot judge a drama from the first time you've watched, for example, if someone is completely new to the Korean drama thing he'll fall in love with anything even the trashy ones, but on the other hand, it's completely different when it comes in the hand of an experienced watcher. What I want to say is that if I had to pick one or two they will be definitely My Name Is Kim Sam Soon and Boys Over Flowers.