I Loaded the Zombie Destruction Engineering System

Bad news: Three years after the end of the world, I was pushed into the zombie wave by my teammates and my girlfriend from Notre Dame! Good news: I was reborn with the only [Zombie Destruction Project] system! With a countdown of 72 hours, I won 2.3 Million lottery tickets at the beginning and bought out a city! When my neighbors laughed at my delusions of being murdered, I welded the roof shut with my backhand and turned my home into a doomsday fortress! They don't know that by killing zombies, they can reveal blueprints for doomsday black technologies such as [Infinite Bullet Production Line] and [Small Nuclear Power Generator]! The tide of corpses came, and the whole city was cut off from water and electricity. They were chewing tree bark, but I was eating hot pot and singing songs on the 28th floor! At this time, the hot stewardess neighbor next door knocked on my door, just asking for a drink of water. And the couple who betrayed me in my previous life are kneeling downstairs, crying and begging me to open the door?