In 2064, mankind has one foot into interstellar civilization - lunar cities are home to tens of thousands of people, Mars outposts are beginning to take shape, and asteroid mining fleets shuttle back and forth. Then, the sky fell. A "silent wave" from the depths of the universe swept through the solar system. All electronic equipment based on traditional physical rules permanently shut down. Space cities fell, starships lost control, and civilization went back four hundred years overnight. Lu Chen, the King of Soldiers, was reborn 72 hours before the disaster broke out, bringing with him the tragic memories of the next five years, and a copy of the [Sky System] from unknown time and space - the ultimate technology tree that transcends this era for an entire era.
