Can be of any genre (not too much romance), and absolutely no love triangles. 
Basically, what I want is a drama that keeps you interested with suspense and stuff. Like the drama Mirai Nikki. 
Thanks...
Something similar to mirai nikki, with lots of suspense, but better in my opinion are:

N no Tame ni
Kazoku Game
Reverse
Yakou Kanransha
I have not seen Mirai Nikki, yet some other options :
Slow paced but really interesting :  Namonaki Doku and its sequel : Petero no Souretsu
Also Bloody Monday season 1 and 2, Kazokugari, Thquiz show (1 or 2), Gakkou no Kaidan...
and non-mystery : Hanzawa Naoki and Shitamachi Rocket...
Maou
The quiz show 2
N no tame ni
Ryusei no kizuna
Liar game 
Orthros no Inu
With all your reco, I refilled my watch list ^^