A childhood accident turns a birthday into a lifelong debt, binding two once-close children in guilt and dependence. Determined to atone, she devotes herself to caring for him, believing adulthood will finally set her free. But as the years pass, his need hardens into control, and her promise becomes a chain. Trapped between responsibility and self-erasure, she must confront whether devotion born of guilt can ever become her own life or if she has already surrendered it.
