Due to an unexpected incident, Yin Shanyue and Yin Chefeng were forced to live together for a month. Their mother, who loved handsome boys, her brother who was obsessed with girls, and her father who listened to his wife's everything. They spent the whole summer laughing and laughing. Gradually, Shanyue knew that she had fallen in love with Chefeng, but she knew that there was someone in his heart, so she did not confess her love to him. She knew that the two were slowly separated. One day, the person in Che Feng's heart came back but he forgot everything and fell in love with his biological brother. Unable to bear the blow, Yin Che Feng decided to listen to his grandfather's advice and study abroad. Shan Yue, who was still in pain because her beloved did not love her, could not forget Che Feng until they met on Valentine's Day five years later...