Sejin, a boy on the verge of adolescence, is taken by his mother to spend the summer at his grandmother’s secluded mountain home. In the languid stillness of the countryside, time seems to stretch without end—until a girl named Heemin suddenly steps into his world.

At first an unwelcome disruption, her presence soon softens the edges of his solitary days, turning the ordinary into something quietly luminous. Yet just as Sejin begins to hope the summer might last forever, time itself unravels: the season resets, and his days begin to repeat, as if caught in an endless loop between memory and desire.