In the Beginning of the Undercover Demon Sect, I Became a Saint by Killing Zombies

[Fantasy + apocalypse + soaring realm + decisive killing] Those who cultivate demons kill people and melt the flesh and blood of others to bless their own bodies. This is not allowed by heaven and everyone will punish them. However, the time traveler Ling Yi, as a native master, was inexplicably sent to the Demon Sect as an undercover agent as soon as he came to this world of Xianxia. In order to survive, he walked on thin ice, and from then on he killed people without batting an eye and ate people without adding salt. Just to make others think that he is a serious demon cultivator. Ten years later: "I have become an elder of the Demon Sect. When I ask you when you will close the net, you say our sect has been destroyed?" In despair, the system gives him the ability to travel through the zombie world. From then on, he opened the door to a new world! Practicing for breakthrough is like drinking water. In all heavens and realms, killing one person is a crime, and killing ten thousand people is a punishment. However, in this apocalyptic world, killing zombies will not only increase my cultivation, but also bring me merit and receive blessings from heaven! When all the righteous sects in the world gathered together: "Ling Yi! You are a big devil, you are harming the common people, and it is not allowed by heaven! Today, we and other hundreds of millions of monks have sacrificed their lives to petition the heavens to send down the demon-suppressing thunder tribulation, and restore peace to the world!" In an instant, thunder rolled from the sky, as if it was the end of the world. However, when a raging thunderstorm hit him, Ling Yi put his hands on his hips like a spring breeze. Not only was he unscathed, he even broke through again! "Who would have thought that I, who cultivated demons and killed countless people, could actually do business with the way of heaven!"