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An unkind woman comes to work as a nanny. Housewife Meng Yuan feels that danger is everywhere. She raises her suspicions to her husband Wu Jie, a policeman, but gets no support. Later, Meng Yuan saw that inexplicable men in black often appeared in her home, secretly colluding with the nanny to hide some ulterior secrets. Moreover, the nanny Yao Fei is getting closer and closer to her husband and mother-in-law, and her marriage is on the verge of destruction. In order to save her marriage, Meng Yuan wrote to find Wang Dong and launched an investigation into the nanny Yao Fei and the man in black...