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"What is the relationship between the sun and clouds?" What she said has always troubled him. He has tried to solve this problem, but failed, and the figure and name have been lingering beside him, everything is like a dream. One day, he mustered up the courage to recall the days when they were together. In his memories, he also understood that although she had left, she still lived in his heart... She never left.

The military has mastered the technology of time and space travel, but this technology has been stolen by a group of people with evil intentions, who intend to tamper with history to achieve their goals. The military also formed a special team responsible for closing the world line and preventing historical distortion. However, things don't seem to be as simple as they imagined.