dans son monde

in one's own world

→ dans
phrase Rare #51,730
in one's own world Can refer to someone being absorbed in their own thoughts or to the world or environment they belong to.
FR: Elle est souvent dans son monde.
EN: She's often in her own world.

Il vivait dans son monde et moi, dans le mien.

He lived in his own world and I lived in mine.

— Good Bye Lenin! (2003)

Personne dans son monde ne devait être aussi ferme que lui.

No one in his world was as firm as he was.

— L'Histoire personnelle de David Copperfield (2019)

Fuss est dans son monde.

Fuss is in his own world.

— Victoria (2015)

Laisse-la retourner dans son monde.

Let her return to her world.

— Dans ses yeux (2009)