Personal understanding is... The two brothers didn't escape the reincarnation at all. Or rather, they escaped, (the crow hit the barrier but their car drove away) but at the end of the film they pass by the place where the mother burned for the second time. At the beginning, they drove past the wheat field, and then the two brothers got out of the car and worshipped their mother. The painting was the clue. The painting at the end was the same as the beginning. The brother told the younger brother that the mailbox was always empty. The younger brother said no need to refuel. It means that they will enter reincarnation again.
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