九十年代中期，李牛妞在高考前后，家庭发生了很大意外，命运出现转折。因家庭矛盾，李牛妞的三妹离家出走，造成了小弟瘫痪在床，压力过大的父亲在外出时不幸车祸去世，奶奶又病危住院。一系列灾难，使这个有着三个姓的七口之家的生活跌入低谷。这时，李牛妞毅然决定放弃学业，协助母亲撑起张家的天，既照顾瘫痪的小弟，又照顾长期患病的奶奶，一人担负起了整个家的责任。八年如一日，李牛妞的努力使小弟恢复健康并考上大学。宋超为报师恩，对张家无私奉献，与牛妞终成眷属。三妹桀骜不驯，又非常任性，给家庭带来诸多灾难，但牛妞仍然不离不弃，在三妹患白血病时为其捐献了骨髓，并最终感动三妹，使她认识到了亲情的重要性。李牛妞从开小饭馆到负责一个大型企业集团，自立自强，在亲人的帮助下，最终事业有成。
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