Starting from ordinary people, the protagonist explains space, time, dark energy, dark matter, physical laws, etc. From the perspective of physics. Step by step, he reaches the limit and reaches the extreme. The beginning of life, the beginning of the universe, and the end of time. What is the ultimate? Rising from the bottom, crawling from the bottom, ordinary people go to the top step by step. So what about the highest point, where should people or life go? So what if it reaches the top? What is the end of all this? Let's look at the ultimate mystery of the universe explained from a physical perspective.