I literally had to use a notebook to get the proper relations of the characters and their names
I am pretty sure you can feel how much complicated this series is and what brilliant it's story line is. The switches between the timelines is just amazing and the way it reveals all the secrets and backstory of those characters forces you to find who is wrong who is right .
Before watching this series I will highly recommend you to just see a video on Grandfather's Paradox and Schrödinger's Cat experiment which will really boost your experience in DARK