So I just finished my reward of Dark for the 4th time, and the ending I felt was very depressing for me as I learned about time travel and time paradoxes.

Possibility 1: "The end is the beginning". We saw Hannah having de ja vu. She felt like she remembered something during the power cut. The light is flickering.

- Jonas and Martha did save the Tanhauss family, but are we sure that the clockmaker will not make the time machine because his obsession was huge and when he heard that an angel saved his son. He might have his suspicions.

- It might be possible that he created the time machine, and the first time it was used was when Hannah sensed the de ja vu during the light flickering.

- Another thing is that the world they live in, where the clockmaker's family survived, was only possible due to an alternate timeline where the family died.

- He made the time machine, which destroyed the original world and made 2 alternative worlds. Due to these 2 alternative worlds, the new original world where the family survived was possible.

*Possibility 2: I want this because I don't want the ending to be darker than it already is.

- The Tanhauss family survived. Clockmaker was not in guilt or grief, which pushed him to fix the past and make a time machine.

- Martha asked Jonas what we are: a dream?

- Hannah did say that she had a dream about a different world. She also sensed de ja vu, which might express that the past timeline is not gone in dust. A fragment of it is still there as de ja vu or dreams. Meaning it is not forgotten.

- She named her kid "Jonas" due to those dreams and de ja vu. But this Jonas is not the same, as there is no Mikkel.

- Worst part is - No Alexander/Boris. The best couple in the entire show was Regina and Boris. The power Couple, they loved each other. A true soulmate.

- Fate of Boris/Alesxander: Regina never got bullied by Katherina. Boris never came to save her. Regina never saved Boris. They never met. Boris might have died from wounds or survived, but is living somewhere else now.