Preface What is happiness? I want to be happy! This is the result that all human beings love; some people spend most of their lives pursuing and finding happiness; some people spend their whole lives not being able to find it or not feeling it. I will use my understanding to talk about the pursuit of happiness, the method of happiness, the cause of happiness and the definition of happiness in my heart. YU LI Feb. 10, 2024, New Year's Eve of the Dragon