Every Level-Up Brings a Curse, but I Can Reverse Its Effects

Monsters invaded, and humanity nearly went extinct, but in the end, people gained the power to fight back. That power came at a price: every level-up brought a curse. From then on, humanity on Blue Star was forever faced with a choice. Don't level up, and humanity has no means of fighting the monsters and will eventually perish. Level up, and every individual is cursed, condemned to torment and a life worse than death. But while ordinary people hesitated, too afraid to level up, Xu Weiyin, who could turn DEBUFFs into BUFFs, only wanted to level up even faster.