No. 42 Wutong Street is an old apartment where four seemingly unrelated women live.
Lin Xia, a gentle illustrator, witnessed a murder but chose to remain silent.
Su Qing, an indifferent executive, was framed after being sexually harassed.
Zhou Nian, an enthusiastic shop assistant, has been stalked by her ex-boyfriend for three years.
Bai Lu, a humble single mother, took her son to escape domestic violence.
They have lived in the same building for three years, and they are nodding acquaintances with each other, never asking about each other's lives.
Until the landlord Aunt Li died suddenly, they found four diaries among the belongings - one for each person, recording the ten years they had been "surveilled".
They were frightened, angry, and suspicious of each other. But as the investigation deepens, the truth gradually emerges——
The darkness they thought they endured alone was always remembered for them.
