上世纪30年代末，古老的中华大地正经受着最为苦难的时刻。外有日寇铁蹄进犯，内有不同派别势力的斗争碾压，战火连绵，生灵涂炭。为了获取重要的情报，共产党方面派出周乙（张嘉译 饰）和顾秋妍（宋佳 饰）假扮夫妻，潜入哈尔滨的警察厅特务科。周乙被任命为特别行动队队长，但他的真实身份一直受到高科长（程煜 饰）的怀疑。
地下工作险象环生，稍不留意就会失掉性命。周乙挂念分别的妻子，怀孕的秋妍担心腹中的孩子、思念丈夫，可是为了共同的理想他们不得不压抑着心中万般情感，共同携手在这条充满黑暗的走廊中前行，只为前方璀璨的光明……

2011 film by Xu Jinglei

2005 film by Wang Xiaoshuai

This story takes place in a city by the Yangzi River where skyscrapers stand around falling slums... In a luxurious apartment an enchanting story of modern China unfolds... As the Chinese economy blooms so does the gap between rich and poor... These events unite an unlikely cast of a lady of noble decency, her power- hungry husband, a manicure store owner, a security guard, and a countryside girl and series of mysterious events haunted them... What happens in this luxurious apartment building? Are you curious? Well, curiosity kills the cat..

Peking, 1948. A winter night. A man returns home to find a letter awaiting him written by a woman before her death. in the letter she tells him the story of her love for him -a life-long passion that has not diminished over time, but one that he has never known. her story spans 18 years from the moment she -then a 13 year-old girl- sets her eyes on her new neighbor. she tells their brief but passionate love in her youthi the hardship she goes through raising their child alone, and their final encounter after the war, during which the man fails tor ecognize her and one which leaves her in despair. Now having lost her son, she no longer has the courage to live on. Only in a letter is she capable of telling him everything, for the first and the last time. shaken by the letter, the man searches his memory for the nameless woman.