I'm in the Wasteland and My Engagement Has Just Been Broken Off.

In 3000 AD, there was a natural rift and dark clouds shrouded the world. Animals and plants everywhere grew and evolved wildly. The three-meter-long Centipede Insect King, the giant tree willow god that covers the city, and the alien beast god that is a hundred meters high. The end is coming! Beast tides, insect plagues, and nuclear winter caused by nuclear explosions. All of them cannibalize the remaining humans. Tyranny, cruelty, and despair enveloped the land. When Ma Heng came to this world of cannibalism, due to his father's death in the line of duty, he happened to encounter the vulgar plot of breaking off an engagement in the novel. Already unhappy, he touched the red-haired devil tattoo on his chest with a grin and set a small goal. "Then let's start by ruling the world..."