“Past Lives” is a wistful what-if story about two people, the children they were and the adults they become. The movie follows them through the years and across assorted reunions, separations and continents as well as milestones momentous and ordinary. “Past Lives” centers on Nora (played as an adult by a terrific and subtle Greta Lee) and a boy named Hae Sung (Teo Yoo), though mostly it’s about her. They’re charming — they’re children — and close. Hae Sung comforts her because he’s a nice boy; he will become a nice man, but by then she will be long gone.

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Persons: Nora, Greta Lee, Hae Sung, Teo Yoo, —, “, ” Nora, ”, He’s, Celine Song, Jacques Rivette’s, Julie Go Organizations: Korean Locations: Seoul, American, Canada, Nora’s