Childhood sweethearts Le Guo and Tang Tian have lived across the street from each other since they were young. When they were young, they could talk freely, and when they were young, could they be happy enemies forever carefree? What kind of love dispute will they fall into? When I was young, who promised to live forever? Can they keep their fate and achieve each other's past and present lives? Can the two people who are not silent about the world resolve the many crises and finally get married?