From the perspective of single parents in the new second-child era, it tells the story of Xu Kaixin (Zhang Yuqi), a second-child mother who is betrayed by a scumbag and her enemies.), who fights back under the double pressure of life and emotion, and actively fights against it. In the process, she meets Mei Chengyi (Han Geng), a baby-raising expert who is also a single father of two children.They met each other, formed a twin family with “2+2 greater than 4”, and started a warm and joyful life.