Awakening the Mechanical Heart, I upgraded an RV into a doomsday warship on day one!

What the story is about

After dying in an apocalyptic future, Xing Tian awakens seven days before disaster strikes and bonds a mysterious Mechanical Heart to a luxury RV, turning it into an upgradeable war vehicle. As zombies, mutated beasts, and stranger threats emerge, he scavenges energy cores, upgrades his vehicle and abilities, and protects two survivors while trying to stay ahead of the escalating danger.