Sungkyunkwan Scandal - I don't like historical dramas and when I first watched it, I did hate it. But after the third episode it got better and I ended up really loving it.
Cleopatra na Onnatachi - I was reluctant for the sole reason that this was a drama about plastic surgery. It sounded weird, it looked weird and I suspected it would be quite offensive. But it wasn't, it turned out to be amazing.
Sunao ni Narenakute - 100 % melodrama, which is the worst genre in existence. And nobody even recommended it to me! I randomly chose to watch it with absolutely no expectations. And I loved it.