In the future, Cheng Xuan, a genius scientist with a doctorate in physics, has devoted himself to researching black hole technology for many years, and finally invented a 'ring' that allows him to travel through time. Cheng Xuan excitedly showed his scientific research results to his girlfriend Weier, and the two used the 'ring' to explore time and space. But disaster strikes when Cheng Xuan becomes lost in time, and his creation may not be everything he believed it to be.