Opening Stores in the End of the World, My Supermarkets Will Be All over the World

[The end of the world + system + upgrade + no cp + store opening] As a newbie in the business department, Chi Chi was sent to open a supermarket in the last days. Looking at the zombies and dilapidated houses in the distance, what should I do? Of course, roll up your sleeves and work hard! From now on, you can open a store on the left and trade on the right. Sell ​​food, water, cars and houses, and then reach the pinnacle of life. Everyone sighed: Boss, please slow down your leveling up. Even killing zombies can't keep up with your leveling up speed. To put it simply, this is the story of a newbie who keeps leveling up and helps people in the apocalypse eradicate zombies.