该剧主要讲述的是从上世纪60年代到90年代发生在老北京四合院几户人家间错综复杂的情感故事。小宋佳在剧中饰演在理发店工作的小姨何爽，与梁家的大儿子梁尘关系极为亲密，然而小姨在婚姻的问题上遭人诬陷，不忍其辱而自尽。故事开始于1960年代，北京的一所大杂院里生活着梁鼎元（杨立新 饰）、舒义海（韩童生 饰）和马福顺（宁文彤 饰）三户人家。老梁的妻妹何爽（宋佳 饰）是个理发师，老大不小了还未成家，老梁没少操心，其实何爽早有心仪之人，那是七年前相识的小提琴手老康（丁志诚 饰）。心术不正的舒义海和副食店唐经理（李强 饰）借机向何爽身上泼污水，倔犟的何爽殉情身亡。从小与小姨感情深厚的梁尘长大后进理发店学徒，目的是查出当年诬陷小姨的仇人。当他刚查出一点眉目，始作俑者之一唐经理意外死去。后来梁尘结识了老康的儿子康凌云（方晓歌 饰）的女友单红（章龄之 饰），俩人一见钟情，老康感觉这是报应，他劝儿子退出竞争。舒义海的女儿兆欣（霍思燕 饰）与梁尘自幼在大杂院长大，她也深爱着梁尘，伹梁尘还是选择了单红，康凌云对梁尘怀恨在心……
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