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In this world, there are mechas, superpowers, spaceships and cannons, genetically enhanced warriors, and incredible brain swords... The vast universe is filled with countless civilizations. These civilizations may be isolated in a corner and remain in ignorance, or they may stretch across the sea of ​​stars and be invincible... When a powerful civilization used unrivaled weapons to knock on the door of Blue Star, the order of the world collapsed... At this time, someone will stand up and lead mankind out of the darkness, break the old order and establish a new order... Shen Xinghai, the destroyer of the old world order and the guardian of the new world order. They are called "shadows" and they silently guard Blue Star behind the invisible curtain. When the world returned to peace and the new order was stable, they retired after their achievements. Some joined the government of the new world, and some worked as cooks incognito... And Shen Xinghai, who felt he had shouldered countless sins, chose to sleep in the cabin. Until one day, he was awakened. It was supposed to be a simple bodyguard mission, but accidents occurred frequently, and Shengjing, which had been peaceful for a long time, was once again in trouble...