When a summer job turns into an interstellar mercenary! Ordinary college student Lin Xiao accidentally passed a mysterious interview and his strength skyrocketed after injecting a genetic optimization fluid. On his first mission, he soloed an elite Zerg, brought back controllable nuclear fusion technology from the interstellar black market, crushed Western technology with alien fighter jets, and brought a cross-era leap to his country! However, the Earth crisis is coming: the Zerg broodmother is sleeping in the vast land of China, and humanity has only two years left. This summer, Lin Xiao will single-handedly turn the tide!