Di Xiu transmigrated, becoming a gray rat in another world. Not only must he build a protective dungeon to safeguard himself and his race, but he must also constantly guard against invasions from other races. Humans, gods, demons, monsters, dragons, elves, ancient taboos... even outworld gods coveting the world! The former order crumbles, and the apocalypse topples the towers of civilization. In the face of life and death, Di Xiu comprehends the truth of magic. Magic is not chanting, but a rigorous set of underlying world protocols! Only with the correct logical framework can it be safely compiled and run. While other mages are still struggling to chant spells with their flesh and blood, Di Xiu is already debugging magic circuits in the dungeon, developing the third-generation gray rat exoskeleton armor, heavy armored mechs, and aerospace carriers... The magical industrial age has begun! The gray rats are building a jungle of steel and gears. Mechanical rats wield precision...

[Features CP, apocalypse, system, shop opening, sweet romance, ensemble cast] [Many supporting characters, not too many awful ones, warm and harmonious] [Female lead: A pretty, laid-back, gossipy bystander] [Male lead: A reborn, pitiful girl with explosive combat power] [Warnings: 1. Not a female-centric power leveling story 2. Prices listed are based on the book's information] Xi Yue woke up to find herself in a strange world. It was the eighth month after an unknown virus outbreak, with hordes of zombies roaming the city. And she was living in the city center! Thank goodness! She had been bound to a cosmic management system and opened a grand hotel in the city center. From then on, the cosmic hotel became the safest refuge in this apocalypse, a sacred place everyone longed for. Just when she thought she would spend her whole life in this world, the system unexpectedly took her to ancient times, extreme weather, ocean disasters, and various other apocalyptic worlds. Let's expand our "cosmic enterprise" to every apocalyptic world! [In the initial apocalyptic world, level 2 crystal cores can be exchanged for 200 level 1 crystal cores, level 3 for 400, level 4 for 800, and so on.]

After a car accident, the delivery man Lin Yang unexpectedly traveled through time to become a shop owner in the underworld. Under the feeling of fear and unreality, he gradually expanded his business, doing business both in the world of the living and the underworld, and eventually become a wealthy businessman who straddled the yin and yang world.