Multiply by Two

This is swimming against the current in the dark, this is the purple string and purple yin before dawn. Have you ever had a familiar set of dreams? Although I have never been there, I feel no impression of it. Have you ever thought about someone you've never met? The memory is obviously so blank, yet so consistent. Didn't get a good night's sleep. In this world, there are no devices, no superpowers, no gods, no souls and reincarnations. What is this? I am Jiang Guran, how can I explain what I have experienced?