Time Travel Begins with an Exchange Mall

I fell headlong into an ancient primitive society. There were many crises in the vast primeval forest. When I looked up, I looked up at the big trees that were covered by eight or nine people hugging each other. As a new modern human being who is not separated from the grain and not working hard, even food and clothing are really a problem. Fortunately, I got an exchange mall that came with a scanned map. Otherwise, how would I get out of this forest where there are wild beasts, snakes, insects, rats, and ants at any time. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.