I also didn't like Secret even though I like melodramas...
Melting Me Softly (I enjoyed all of the screenwriter's other dramas but this one was the worst)
When the Devil Calls Your Name
Biscuit Teacher and Star Candy (annoying love triangle)
Eulachacha Waikiki 2 (not as funny/memorable compared to the original season and I was upset that Joon Ki broke up with Soo Jin and got together with the other new girl
Leverage (for some reason it didn't grab my attention as much as Player)
Oh My Ghostess (it is boring for me, I only continued because of Park Bo Young)
The Heirs (plot was meh, I just liked watching Kim Woo Bin's character the most)
Avengers Social Club (this also bored me, I don't get the high ratings for this one)
The Cursed
Kakafukaka
Junichi