How can you find the lost star if it shines gone for a long time ago?

Mirren does not have a family but she have a beautiful life with the man that accepted and loved her just the way she is.
She always have Fin to hold on in times of difficulties and sorrows, Everything is fine in those times that she's with him until an accident happen and it changes each situations.

She thought that Fin went back home from death to life when she saw him standing in front of her. Mirren knows that he passed away five years ago but who is this guy?
Why does he wear the same smile of Fin?

Why does the stars in the sky shines brighter whenever she is with him?

(Ongoing story)