Doomsday Killing System

Alien creatures invaded the earth, most humans turned into zombies, and a small number of humans reverted to their ancestors and gained the abilities that their ancestors had. Animals also began to slowly evolve into prehistoric creatures. Ye Feng: I don't have awesome ancestors, but I have a killing system. As long as the killing value is enough, I will kill you for you. That descendant of Hongjun, don't run away, contribute your killing points to me, and gain some of your abilities.