You're waiting for a spectacle that never comes. What arrives instead is a father's hand opening, a thumb-sized child standing in his palm, and the understanding that you are watching someone's entire prayer answered in the smallest possible way. The film knows that desire does not scale with size, that a life the length of your finger can contain infinite devotion, and it spends its quiet runtime proving this with the kind of tenderness that makes you forget you're watching anything as strange as a couple raising a child no bigger than their thumb.
A couple longs for a child and prays to God for one, saying they would welcome a son even if he were only as big as a thumb. The film is a drama centered on that humble wish and the hope behind it.