In "My 'Perfect Life' When My Sister Was Born," the story likely revolves around a protagonist who experiences significant changes when a new sister arrives. Initially, she might feel like she has a "perfect life," filled with attention and love from her parents. However, the birth of her sister shifts the family dynamics, leading to feelings of jealousy and neglect.

As the narrative unfolds, she grapples with her identity and the need for attention in the face of her sister’s arrival. The story explores themes of sibling rivalry, the complexities of family relationships, and the challenges of adjusting to change. Ultimately, the protagonist may come to appreciate her sister and learn valuable lessons about love, sharing, and the evolving nature of family bonds.