Reborn Before the APOCALYPSE: I Built a 20,000 km WALL in 3 Months and Became the NEW WORLD KING

What the story is about

After humanity is destroyed by invading gods, Lynn Fan awakens in his high-school body three months before the apocalypse, carrying memories of the failed war. He persuades Da Xia’s leaders to prepare for the invasion, mobilizing the nation to build defenses, recruit soldiers, and train martial artists to fight gods.