少年李子文因父母计划生二胎，被迫将心爱的流浪狗白云赶出家门。他一度想通过举报电话改变局面，却在犹豫中放弃。最终，母亲流产、白云走失，命运无情地撕裂了生活的平衡。在失去与成长的痛楚中，子文渐渐理解了父母的苦衷，感受到命运的无常。 　　Young Li Ziwen is forced to part with his beloved stray dog, Baiyun, as his parents plan for a second child. He contemplates making a report to change the situation but ultimately hesitates and refrains. In the end, his mother suffers a miscarriage, and Baiyun goes missing, leaving the family in quiet devastation. Through loss and growth, Ziwen comes to understand his parents’ struggles and perceives the impermanence of life.