Global Apocalypse, I Am Left on the Ground

The sun mutates and the world enters an ice age. High-level officials from various countries selected survivors as human fire and built spaceships to escape from Blue Star. Su Mu traveled to this world and drew a waiver, thinking that he had awakened to the black technology system when his time was running out. Build giant underground cities and develop new energy sources. Create a survivor alliance to save abandoned humans. … Human beings who escaped hundreds of years later found Blue Star from the recorded information. After wandering for hundreds of years, they decided to go back and have a look. By the way, save the humans who are lucky enough to survive. But when they saw a warship dozens of kilometers long aiming its star destroyer cannon at their spacecraft, everyone was stunned. You call this a post-apocalyptic Blue Star?