The male protagonist Lin Yan, who was a Ph. D. In structural mechanics and energy engineering at the Federal University of Technology in his previous life, died in the third year of the apocalypse in a fortification he designed himself. At that time, in order to save materials, he simplified the stress calculation of key nodes. The aberrations caught the weak point and broke through. He watched helplessly as his sister in the shelter was dragged away by the berserker. He was reborn 72 hours before the end of the world and was sitting in the laboratory debugging the simulation program of a new type of controllable nuclear fusion reactor.
