Hi there fashionqueen :) (lol I made a mistake with the name, sorry. It has been fixed now.)
All the time travel dramas with a historical theme that I know have been mentioned, so that leaves me with one more drama.
- NEXT (here is the MDL link
http://mydramalist.com/korean-drama/2928/next)
Its a drama about fate. It has four eras, two historical, and two modern; the four main characters keep meeting on all the different lives.
And I agree with A Tree With Deep Root being a great drama. It's my favorite historical drama :)