Hana Yori Dango / Boys Over Flowers - I do not understand the appeal of any version of this show. Please stop making it.
My Love from the Star - Jun Ji-hyun acted circles around everyone else in that drama but even she couldn't save it from itself. Frankly it felt like it was trying to be at least 2 different dramas and succeeded at neither.
Secret Garden - the male lead is extraordinarily obnoxious and the body-swapping premise was not used well.
The King: Eternal Monarch - all Vibes (tm), no substance. I am relatively easy to manipulate into having emotions about fictional characters, but I could not buy into the romance for the life of me.
Descendants of the Sun - it was...fine, but did not nearly live up to the hype.
Goong - there is a kernel of an actually good drama in here, but the execution (and acting) was meh. If they get around to the remake, I'd give it a chance but I'm not optimistic.