Doomsday: I Have a Killing System

Jiang Feng, who was just about to go to college, traveled to a week before the end of the world. After one week, the world will change drastically. There will be a rain of blood in the sky, and those caught in the rain will mutate. The lucky ones will become evolvers, and the losers will become zombies. On a planet where zombies are rampant, how should Jiang Feng survive in this environment...