We also have the same word in English, as "sonder".
> noun, the feeling one has on realizing that every other individual one sees has a life as full and real as one’s own, in which they are the central character and others, including oneself, have secondary or insignificant roles.
> noun, the feeling one has on realizing that every other individual one sees has a life as full and real as one’s own, in which they are the central character and others, including oneself, have secondary or insignificant roles.
https://www.dictionary.com/browse/sonder