The Company's Undercurrent Book tells the story of Lin Wanxing and Elena who are forced to walk side by side between the changed order, secret rules and the truth of the past. The two people's positions were not completely consistent at first, but through repeated pursuits, temptations, and loss of control, they gradually saw the bigger shadow. They must not only protect what they cherish before the situation collapses, but also find the path that can truly change their destiny amidst lies and costs.