What kind of book do you think Guiguzi is?

Gui Guzi flexibly used the ancient theory of Yin and Yang to explain and control the fierce social contradictions in the Warring States period, formulated a set of tactics to understand and intervene in society, and constructed a systematic theory of vertical and horizontal lobbying. This theory has trained outstanding lobbyists such as Su Qin, Zhang Yi, Chen Yi and Gongsun Yan, staged dramatic scenes of "United Vertical" and "Lian Heng" on the historical stage, and manipulated the political struggle situation in the Warring States for about a hundred years. Guiguzi's systematic lobbying theory not only influenced the political situation in the Warring States period, but also had a far-reaching impact. It is unique in the field of China's ancient philosophy and political thought, and has pioneering significance in the history of China's rhetoric. It has also been interpreted and applied by religious scholars and military strategists from different angles.