You cannot enter the same river twice, the philosopher argued, implying that time is running out irrevocably. However, the story of Kevin and Tracy is an exception to the rule. Having lost their only child, they could no longer live together and divorced. But a misfortune happened to Kevin, he lost his memory, and no one except his ex-wife can help him remember everything. When Tracy reconnects with Kevin after two years apart, she realizes that she loves him. Time has turned back, but the tragedy of the past still stands between them...