I, Wang Tiezhu, a gold-medal wilderness survival coach, actually slipped while performing free-handed rock climbing for the rich second generation. When I woke up, I was facing the roar of a saber-toothed tiger. I took out the thermos cup with my backhand, and the sunlight reflected blinded the tiger's eyes. The furry primitive people who were watching knelt down on the spot and shouted, "Angel of the Sun!" I stared at their animal skin skirts and fell into deep thought: Since I can't be a coach, it's not bad to be a CEO of a primitive tribe. Teach them how to weave straw sandals, dig traps, and build adobe houses. The tribe next door is jealous and comes to grab food. I directed everyone to put the skunk glands into the sling: "Come on, ancient version of biochemical weapons!" In the smoke, I stepped on the enemy leader's back, and suddenly discovered that the carabiner hanging around his neck was actually there. ——Are there other time-travelers in this poor place?