Rebirth: Individual Upgrade System

Five years after the end of the world, I was betrayed by my closest relatives, my bloodline was taken away from me, I was abandoned in the wilderness, and I died with hatred. Once reborn, I returned to the moment before the catastrophe and accidentally bound the "Individual Upgrade System"! Experience, levels, dungeons, divine equipment, skills... Everything is available for you to kill! Zombies, mutated beasts, predators, extraterrestrial monsters... They are all used as resources for my upgrade! The regrets and humiliations of the previous life can all be repaid in this life! I used the system as my blade, used killing to pave the way, and climbed to the top step by step on top of the ruins. From being alone to rising in power, from humble survival to dominating the world at the end of the world, There are no adventures, no favors, only killing and upgrading to create an invincible road! When darkness covers the earth, when despair engulfs people's hearts, I use the power of the system to kill all the evil spirits and restore order! In this life, I don't rely on heaven or earth, only on myself—— Return after rebirth, level up alone, and dominate the end of the world!