One day, a certain city released a video from several decades ago. Finally, humans understood why that explosion occurred, the one that changed all of humanity.,Brilliant City, a city built within massive defensive walls. It is called Brilliant City because it was the first human city to utilize planetary unique materials to develop an artificial sun. It is a gigantic city with a population exceeding 30 million.,For a moment, the hall descended into chaos as questions flew one after another.。