In 2050, a sudden drop in solar activity triggered a "flare-particle torrent". The global temperature dropped to -80°C within 72 hours, and 90% of humanity was frozen. Aerospace engineer Lin Ce activated the "Galactic Federation System" in the ruins of the subway, relying on black technology to work side by side with the national team, building infrastructure, mechas, and stellar cannons all the way from the frozen earth to the frost mother planet, and finally established the Galactic Federation and ignited human interstellar civilization.
