I think the mutation timeline for zombies continued to move forward even after he regressed back,so maybe that's why the mutants are appearing earlier than in previous regressions.
Another theory is that MC is being used as a "future scout" by the zombie Goddess. This would explain why all the places the MC knew were safe were getting attacked early. The zombie Goddess saw all these uninfected locations during the MCs previous lives and is sending zombies to all the safe places the MC scouted to make sure every single person in the world (korea) is infected.
I think the mutation timeline for zombies continued to move forward even after he regressed back,so maybe that's why the mutants are appearing earlier than in previous regressions.
Another theory is that MC is being used as a "future scout" by the zombie Goddess. This would explain why all the places the MC knew were safe were getting attacked early. The zombie Goddess saw all these uninfected locations during the MCs previous lives and is sending zombies to all the safe places the MC scouted to make sure every single person in the world (korea) is infected.