se volverán

will become

→ se
phrase Rare #36,832
will become Used for a change of state or condition; often means "will turn" with colors or qualities.
SP: Las hojas se volverán marrones en otoño.
EN: The leaves will turn brown in autumn.

Les contaré tales historias, que ellos mismos se volverán locos.

I'll tell them such stories that they'll go crazy.

— Moscú no cree en las lágrimas (1980)

Se volverán todos locos.

They will all go crazy.

— Oppenheimer (2023)

Después de la tormenta, se volverán padre y madre.

After the storm, they will become father and mother.

Ah, ¿cuándo se volverán a encontrar?

Ah, when will they meet again?

Y jamás se volverán a ver.

And they will never see each other again.

— It's Such a Beautiful Day (2012)

Con el Dios Ciervo muerto las cosas se volverán claras.

With the Deer God dead, things will become clear.

— La princesa Mononoke (1997)