Prehistoric Supermarket: the Security Guard at the Beginning Is the Demon Ancestor Rahu

"I traveled through the prehistoric times and opened a supermarket. The starting reward was an employee card - the Chaos Demon God Rahu, who was resurrected as a security guard! A monthly salary of 500 merit points, and a pack of Huazi per day. The leader of Tongtian came to buy beer, and the Immortal Killing Sword Formation was mortgaged at the door. Master Guanyin? He was secretly eating spicy sticks in the snack area!"