I just finished the handmaiden and to me it was a truly magnificent movie. It can get pretty graphic and leaves little to the imagination. Going into the movie i knew very little about it but I would say that you can go into this movie without knowing too much as long as you´re aware it is 100% for a mature audience.
The relationship between the two female leads is shown very well especially given the time period the movie is set in. The twists and turns the story takes throughout its 3 parts (it says which part the movie is at in the movie itself) was everything i could have hoped for. The acting is phenomenal in my opinion, the story very well written and the music ties it together perfectly.
I give this a highscore for everything else but i wouldn´t say it has a lot of re-watch value. It is very much a one of those experiences that is fantastic once but would just not hold the same magic the second time around.

It really isn´t for everyone and if there are certain topics that you are sensitive to I would suggest doing your research on the movie first.