This song felt right for this story because it talks of the life they're gonna make. I feel like this depicts this day for Pavel and Hannah. They are making their life together. They bring their million dreams into a new and beautiful life together.
I also absolutely love The Greatest Showman so I jumped at the chance to add in a song from the soundtrack!
A Million Dreams from Greatest Showman Soundtrack by Benj Pasek and Justin Paul uploaded by Chim Chim My Love