Additionally, there was a third dimension called the Origin World, which was the source of the Knot and the only place from where it could be ended.
Needless to say, the Knot was destroyed and everything within it ceased to be forever including all the characters and their various iterations.
The show ended with a cryptic final scene involving a group of characters in present-day Winden in the Origin World.
The characters Katharina Nielsen (Jordis Triebel), Regina Tiedemann (Deborah Kauffman), Hannah Kahnwald (Maja Schöne), Peter Doppler (Stephan Kampwirth), Torben Wöller (Leopold Hornung) and Benni Wöller (Anton Rubtsov) were at a dinner party together, suggesting they were the only ones to have survived and essentially “real”.
source: express.co.uk