Wang Xiaomi's (Wang Xiaochen) ideal love is to be spoiled like a little daughter, so she finally decided to marry Mark (Zhang Jiayi), who is much older than her. Although Mark really dotes on Wang Xiaomi and loves her, reality is reality after all, which is much more cruel than Wang Xiaomi imagined. Mark had a failed marriage, and after divorcing his wife, he raised his daughter Mary. This means that Wang Xiaomi officially became a stepmother from the moment she married Mark. What's worse, Mary is at the rebellious age of fifteen, and has a very serious resistance to her stepmother who is not much older than herself. In addition, Mark's ex-wife always appears in their lives again and again. As time goes by, Wang Xiaomi gradually feels powerless.