Arya Nicolette Beatrice lives in a certain paradigm that makes her function mechanically. She tends to block any form of sentiment in her drive; there's only one rule ought to be followed so she can live her life in peace. Always listen to what is superior, head over heart.
Yna tends to live by the book, everything that is not factual is absurd. Everything that is based on cheap sentiment is highly preposterous. That is until all of the things she worked hard for starts to disintegrate. Into little pieces, bit by bit. Slowly, till everything seems hopeless.
But when the sky was mourning for her in the desert, she understood what living truly meant.