该剧以郑向东和苏扬的爱情故事为主线，讲述了一个横跨了三十年的爱情故事。1976年的某知青点，酷爱拉小提琴的知青苏扬与郑向东热恋，却因为误会和意外而失之交臂。一直暗恋苏扬的司梦南趁机接近苏扬，两人走到了一起，却又屡次猜疑、背叛苏扬。郑向东和同学孙千雅一起复习准备高考，孙千雅对郑向东情愫暗生。苏扬为了照顾生病的父亲而放弃了大学之路，但她在知青点学到的缝纫手艺和服装设计上的天赋为她打开了另一扇通向梦想的大门。苏扬不知道当年以为夭折的儿子郑好已经被郑家养大成人。司梦南嫉妒心作祟，处处针对郑向东。饱经磨难和坎坷，苏扬在服装界取得了巨大的成功。苏扬终于知道了郑好的身世，孙千雅却身患重病，苏扬选择让孩子永远认孙千雅为妈妈。经历了一切之后，当年意气风发的知青们感受到了岁月和人性的洗礼。
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