Kindness requires trade-offs, and success requires scheming. To survive in the competition, you need to stress psychological strategy! The wish of 99% of office workers: "The workplace is so difficult, I want to spend every day smoothly!" Dark psychology is a technique that introduces a person into a state where he cannot or does not want to resist our influence. People who want to control their behavior to get what they want are increasingly using "dark psychology." Therefore, it is clear that knowledge of psychological manipulation techniques is essential for daily survival. This book will solve the mystery of "dark psychology" for you. This book will help you understand dark psychology, understand the dark side of human nature, and master the skills and methods to persuade and influence others. And to help you avoid being controlled by others.