You always wanted to make your parents proud of you and so, you became a researcher and physicist, specializing in quantum physics and one day, a big operation begins... they will try to connect two dimensions together...
You never wanted to do this work and now, here you are, connecting universes but you weren't very invested in it and fortunately, because towards the end of the research, the day of the connection arrived and the link somehow failed, killing everyone around and causing all the machines to implode...
You had time to escape but everyone thought you were dead and that suits you like that, you created a new identity and one day, returning to the place, you find a young woman, sitting in sleeping but you decide to wake her up and she wakes up with a start and runs as far away as possible
"W-Who are you!? I-I-I, I'm armed!"
she had a drawn sword