Five years after breaking up with his college sweetheart Nora, successful ad man Ben unexpectedly reunites with her as his new partner at work. But whenever Ben reveals his true feelings, his consciousness is thrown back five years into his younger self. Determined to fix the mistakes that ended their relationship, Ben begins rewriting the past—only to discover that every change can reshape the present. To win Nora back, he must finally face the one thing he has always avoided: telling her the truth.