Hello, I''m into historical dramas recently so i will need a help to find a new ones to watch in future, because soon I will end Warrior Baek Dong Soo.

The ones I've watched so far are :

Secret doors

Warrior Baek Dong Soo(lets say)

Empress Ki (such drama)

Faith

The tree musketeers(I've enjoyed it a lot)

Bridal mask 

I didn't enjoy Secret doors much. Mostly because the pacing of story felt a bit off. I felt like there was only political talking and it was the feeling like i was watching really bad melodrama sometimes.

I feel like i have to aware you - I hate watching drama in bad quality so please dont recomend me anything that can't be found at dramafever/hulu/viki.

Best regards

Queen Seon Duk is my all-time favourite historical drama, so I highly recommend that one! It's longer than Empress Ki, but really worth the time.
For a lighter, funnier one I'd also suggest Sungkyunkwan Scandal!
My favorite historical drama is The Princess' Man, you should definitly watch that one. :D You should also check The Moon that Embraces the Sun.
I don't know if you only watch korean dramas, but if you would like to try some chinese, Startling by each step is one of the best historical dramas out there (but only the first season!).

Good luck! :)
If you like historical-action drama (warrior baek dong soo), try this:
Chuno
A tree with deep roots
Yi San (baek dong soo source story) 
The return of iljimae
Shine (now airing) 
I am an historical drama lover, thus, i will recommend  my favorite ones.

The Princess' Man (Top one)
Jumong ( love it)
Dong Yi ( romance, adventure)
A tree with deep roots (mostly action)
 Iljimae ( action, some romance)
Chuno (Action)
Jejoongwon ( Romance, medical)
Queen Seon Duk
The Kingdom Of The Winds

Period dramas:
The Bridal Mask
Gu family book ( period drama, super natural, romance)

I also recommend "ruler". It's a bit over the top but lots of fun. 

Moonlight Drawn by Clouds