Travel to Ancient Times and Fight Zombies

Zhang Qian traveled to another world and found that the background was ordinary ancient times. He used the golden fingers he obtained to develop technology. What he never expected was that before your technology tree was fully lit, a zombie virus crisis broke out, which meant that it would become an ancient version of the biochemical world. How should Zhang Qian turn the tide and save this world that is about to become the end of the world? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.