Doomsday Countdown: From the Start, I Turn In Swallowed Star

An alien civilization arrives, and humanity will perish in 2025! Reborn four years earlier in his college dorm, Ling Tian unexpectedly awakens the ability to transmigrate into the world of Swallowed Star! With only four years left, he chooses not to look out for himself alone. Instead, he calls the central government's red hotline: "My name is Ling Tian. I request permission to hand an entire world over to the nation!" As the Nine-Layered Thunder Blade, the genetic energy cultivation method, dragon blood, and Wood Bud Crystals are presented one by one, all of Dragon Country erupts in excitement! The entire nation mobilizes to prepare for the final battle! Four years later, when the "god" disguised as a comet descends, it is met by the Blue Star fleet, now evolved into an interstellar civilization, and billions of gene warriors! Will Earth's last stand against extinction also become the spark that ushers in a "New Era"? Follow Ling Tian's path to power and explore the answer! (This is fanfiction! The original story will be adapted to some extent. If you don't like that, please don't read!)