I rec Flower Boy Next Door and Hi School Love On, both are super cute.
To recommend something to someone with nearly 200 complete dramas and Jdramas no less, is a feat but I'd recommend Death Note & Parasyte for obvious reasons.
@Bipasha

From your PTW list, I liked Missing Noir M and Once Upon a Time In Saengchori the most of the ones I've seen.  Missing Noir M is pretty grim, but also very good.  Saengchori is kind of a crazy ride, but I really loved the ending and found it surprisingly moving for such a wacky show.  
@zeamays

Shark, Special Affairs Team TEN, Secret and The Princess' Man ^^
@Nocturna: Mitsu no aji! :)

It's slow and melo, but for what it's worth, I loved it during my early days of drama watching. It's rare to see it on someone's ptw-list. 

Fated to Love You
Marriage, Not Dating
Pinocchio
The Master's Sun
@Ash

From 5 to 9
Hotel Concierge
Kazoku Game
Ouroboros
TENSHI TO AKUMA - Mikaiketsu Jiken Tokumei Koshouka
From Five to Nine
Hana Kimi
Kazoku Game
Love Shuffle
Nobunaga Concerto
Nodame Cantabile
Ouroboros
@HAZEL
Grave of the Fireflies (it's a warming yet sad story set during the WWII )
@Georgie

Loving, Never Forgetting - I'm still making my way through it, but it's a really angsty but satisfying drama so far. The dubbing is sometimes annoying, but the actors push through that (especially the main male actor) and I find myself becoming quite absorbed in the story. 
@ViolinGal 

The Lover was one of the most hilarious dramas I've ever seen. 
@Nagelfar

Ouroboros
Yankee-kun to Megane-chan
School 2013