When Margaux Meets Margaux

Margaux, 25, is trying to finish her master's degree and is about to end a career and relationship. At a party, she met Margaux, a 45-year-old school history teacher. Not only were they famous, their life experiences were exactly the same. When the young self meets the middle-aged self, how will the two people, who have the same soul but different ages, find a better future for each of them?