Heavens: Infinite Time Travel

Is time travel a good thing or a bad thing? Some people died just after crossing over, and some people took off right after crossing over! But many people have met together, so who is the protagonist? An ordinary student who had just graduated and had not found a job was transported to a world full of zombies. Fortunately, there are still dangers, but I find that I am not the only time traveler in this world, and every time traveler has dangers. People are scarier than zombies, and people with cheats are scarier than zombies. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.