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After the end of the world, the world has undergone tremendous changes. A technology company that has mastered a special mineral, V Mine, built four huge mobile cities called Yuedian Technology City after the apocalypse, replacing the concept of country and becoming the last territory of mankind. Before the end, a group of "unlockers" who were transformed by mysterious technology woke up after the end, and with their mysterious technology, they began to solve the mysteries shrouding the world...