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Ha-yeong, shaped by a life of constant moving, keeps people at a distance until she unexpectedly opens her heart to Heui-won. When they attend the same school, the two create an Eternal List, a promise of things to do together as adults. After Heui-won breaks that promise, Ha-yeong's time comes to a halt and she retreats to a cafe attic, cut off from the world. One day, Do-woon appears holding the long-lost list, and with his arrival, Ha-yeong's frozen time begins to move again. Can a promise from the past lead them back to the present?