There Was a Global Power Outage and My Dungeon Was on Fire

The world is experiencing a power outage, civilization has collapsed, and everyone is struggling to survive in the cold night and chaos. But I activated the [Doomsday City Lord System] and sat alone in an all-powerful dungeon. When the snobbish uncle and his family kneel in front of my door just for a bite to eat; When the aloof school beauty who once looked down on me begged me to take him in with red eyes; When the rich and powerful people in the past used their billions of wealth just to exchange for a place of residence... I stood under the warm light, overlooking the dark apocalypse, and opened the protective door with a smile: "Want to come in? Yes. Prove your worth first."