A six-year game of strategy holds the human world in its grip, while an experiment traps countless young people in a predetermined fate. In the darkness, Yang Shuo and Zhao Jingyu break the deadlock and defy destiny, escaping their appointed sacrificial ending and clearing their names at last. In the end, they bring peace to the land and restore ordinary life to the world. When all their suffering has passed, the two choose to venture together into deep space. With their twin cores, they establish a boundary, and their bodies become torches guarding the endless night. The road ahead holds neither day nor light, but behind them, peace endures year after year. From then on, the long night has its guardians, and the human world is safe.
