After Thanos Rewrote History, Quentin Beck History Was Massively Changed. Rewriting almost everything.
Quentin Beck as born to a Unnamed father and mother And lived on the streets with his brother. Jonas Beck. They were eventually Brought in by thanos and Trained In Thanos Academy. At Some point. They Created Advanced Technology And took on The names Mysterio And Mr.Mystery.
Quentin was approached by a mysterious man claiming its time he remembers something hes forgot. the man then restored the memories of his previous life.