There are so many. But I'll go with
7 King2Hearts: The idea was interesting, a North Korean special agent becoming the queen of South Korea, but the story ended up being just the usual palace intrigue, and I didn't think there was much chemistry between the leads. I'm particularly not a fan of the ML, whom I think is very limited as an actor.
8. When Time Stopped: The first few episodes were pretty good, as the ML got right into his unusual powers, but then the story careened into some sort of parable about free will, centering on a guy in a white suit who ostensibly is God. I will say that the comments section on Viki were pretty entertaining, with fights going on between the religious and the non-believers, lol.