Chen Zhaodi's mother, Lu Xiaoning, was a wealthy family's daughter who was trafficked into the mountains. When Lu Xiaoning was seven, her family finally found her and brought her home. But years of abuse at the hands of Chen Zhaodi's father had left Lu Xiaoning with severe psychological trauma—so fragile that the slightest disturbance could send her into an emotional breakdown. Because of this, everyone came to resent Chen Zhaodi for carrying “that man's blood,” and Chen Zhaodi gradually came to believe she never should have existed in her mother's world. The two are bound by love and longing, yet drift farther and farther apart—until, many years later, they finally untangle the knot between them and step out of the invisible cage that trapped them for more than twenty years.