Recommend me drama's?

Hello!

I'm a crime/thriller/action/horror watcher, and I wanted to see if you have recommendations for me.

I like drama's like the ones OCN makes, if that helps anything.

Thanks for helping!

Signal - My all time favourite crime drama, if you are into crime dramas you must check out this one as well
Tunnel - currently airing, so far so good - if you ask me it is better than voice in every aspect
Two weeks
I was gonna add Bad Guys and Missing Noir M too but I saw them at your list
I like Ghost but dont know why dont want to recommend that one it is unnecessarily long if you ask me 

it could be more light but you should check out
- Healer - My favourite action drama , I discover Ji Chang Wook here ;)
- I Remember You - That one is also action romance drama

I'd add to the list a new movie that came out which is cool:  Confidential Assignment 
plus:
Missing You  
Secret

I'm personally a fan of some of those mentioned above:
Signal
Defendant
City Hunter
Healer
Tunnel
Shark

panda's recommendations are all good