Mind recommending some dramas that deal with time? For example, someone from the future goes to the past, someone from the past goes to the future etc.

Queen In Hyun's Man
Time Slip Dr. Jin
Another Parting
Rooftop Prince
God's Gift- 14 Days
Faith
Thank you very much!
Nine: Nine Times Travel
Signal, Splash Splash Love 
Splash Splash Love


That's all I've got right now - It's the only one I've watched with time travel.
I've heard wonderful things about Queen In Hyun's Man though and it's on my list!
Faith
Dr. Jin
Queen In Hyun's Man
Rooftop Prince
etc (When I can think of more)
My Love From Another Star has a lot of going back and forth comparison between the past and future.