In the End of the World, I Picked up a Zombie Machine

The zombie crisis has erupted for seven days. Raleigh watched everything collapse at such a speed. In isolation, he hid in his apartment as a shelter and struggled to survive. In such a world without any hope, a person without any hope encountered something that changed the rest of his life. An ordinary zombie, just before Raleigh was about to kill it - a laser burst out! Who are the talking zombies that suddenly appeared, or machines? Where does it come from? What does it want to do? Why didn't it attack itself? Mysteries follow one after another. And Raleigh will find the answer. (No system, no plug-ins, please pay attention to the second protagonist, the Riddler, in the early stage)