
I just found out a review written by Orson Scott Card. It is quite consistent with my explanation of the movie.
He writes the best summary:
In fact, the time travel stuff is more of a smokescreen. At heart, this is the story of a young man who is doomed -- and a merciful God who gives him twenty-eight days of a life that never existed, in which to become a hero and a rebel, and to find love.

Recent comments
1 day 4 hours ago
Posted by: Kiana
1 week 2 days ago
Posted by: Stranger
1 week 4 days ago
Posted by: silveredie
1 week 5 days ago
Posted by: Innsmouth
1 week 5 days ago
Posted by: Hic
2 weeks 5 days ago
Posted by: epicflyboy
3 weeks 2 days ago
Posted by: My Name is Frank
3 weeks 6 days ago
Posted by: whipit
3 weeks 6 days ago
Posted by: cantgivamouseshorse
4 weeks 4 days ago
Posted by: Innsmouth