Apocalypse Reincarnation: My System Is Myself!?

[Infinite Rebirth: Learning to Slay Zombies in the Apocalypse] I have a blade called Reincarnation. It can kill the living, slay the dead, and even sever the cycle of reincarnation. [Apocalypse survival + zombie mutations + infinite rebirth + Tang Hengdao sword + not grimdark + mildly feel-good + ensemble cast + no System, no pocket dimension, no heroine] Yes, this is the clichéd story of an ordinary office worker with nothing going for him who charges into the apocalypse, goes through countless cycles of rebirth, struggles to survive and grow, and eventually becomes the savior of two worlds. It's also a story about courage, growth, and responsibility. Baili Hui thinks he's terribly unlucky. After graduating, he couldn't find a job. When he finally did, it was at a garbage company. He reported the company and got it shut down, but lost his job in the process. Well, the job wasn't all that great anyway. He'd be better off going home to lie flat and play on his phone... But why was he killed with a single slash by a mysterious man in black as soon as he got home? And why, when he woke up, was there another version of himself staring back at him?! Why was this other self saying that zombies would break out in two days? What was going on?!! Most importantly, why? Why? He had nothing! No money, no System, no pocket dimension, and in the end, not even a girlfriend! Faced with such a disastrous start, Baili Hui wanted to die on the spot... But the other version of himself told him, “It's okay. Even if you have nothing, you still have yourself. You can rely on yourself to fight your way through the apocalypse and become the last one standing!” Baili Hui hugged himself and shivered. “How about I just keep my head down? That sounds pretty good...” (Not grimdark, but not holier-than-thou either. It aims to show both the darkness and the goodness of human nature.)