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Li Fei: After I traveled through time, the country's science and technology progressed for a thousand years. ... "You mean, you're about to travel through time, so you came to the police station to seek help?" "Yes." "Which world do you want to travel to?" "In a world of zombie crisis, comrade police officers, I can hand over the rewards I received to the state. Now I only need a pistol for self-defense." "What kind of rewards can you get in a world of zombie crisis? Nothing but various potions." "Perpetual motion machine." "What did you say?" "Perpetual motion machine." Pointing at the lively and energetic zombies in front of him, he looked at the young man in front of him, "You think this is a perpetual motion machine?" Li Fei nodded, "Yes, this is a perpetual motion machine." This is a story about a time-traveler benefiting the country by relying on the rewards he received from time-traveling.