You were in your world (May it be your persona's or real life) and suddenly your in a white room filled with people, the characters will be listed in the character description

Raiden Ei: Where are we...and...is that you Barbatos, Morax?

Zhongli/Venti: Yes...

Childe: Where tf am I...?

Lumine: ...?

Suddenly an unknown voice is heard

???: Hello those of Teyvat, you are here for enter-...just do whatever in there..buh bye!

The voice stops being heard

Nahida: ...I'm not insane right...we all just heard tha-

???: Also someone else will join you soon! Bye!

The voice stops again