I Asked You to Hand in Your Paper, and You Hand in the Nantianmen Project?

Natural disasters strike and civilization overturns. Lin Jun, the chief scientist of the Nantianmen Project, died together with his final enemy, but was reborn and returned to the six months before the disaster. At this time, he was just a failed doctor who was expelled from the school and whose achievements were stolen. Facing the impending doomsday, Lin Jun smiled. "Are you still complacent about the drone algorithm? My 'swarm' thinking has been armed with every screw." "Your ace fighter is still using a turbofan engine? My 'Xuannv' aerial fighter is already preparing to jump to the star sea." "Are you still afraid of the energy shield of the Ruin beast? Sorry, my electromagnetic rifle is within the range of all living things!" Starting from an abandoned factory, build a technological kingdom across the stars. When the world falls into despair, a torrent of steel from the east will hold up the red sky of human civilization! I, Lin Jun, will restart civilization with the power of one person! This book is also called "Rebirth: Build the Shadow Mecha at the Beginning!" Mecha airborne, mission must be achieved