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Who are we? Where do we come from? Where to go? The protagonist is a twin brother. The older brother is an astronaut stationed on the moon base and mysteriously disappeared during a mission. The younger brother is an ordinary company employee. In order to complete the world cultural heritage protection task assigned by his superiors, he searched for Zheng He's navigational charts. Two clues unfolded separately. The brother observed a mysterious cosmic signal in the moon's sky eye, thus uncovering the mystery of human life. Although the younger brother found the navigation map, he was also involved in a conspiracy. So in the subsequent process of searching for answers, the two threads finally intertwined. While the two brothers solved their own mysteries, they also finally understood the meaning of their lives.