The story begins when Styx agents Wen Shengsheng and Yin Yi are ordered to go to Earth, pretending to be high school students to hunt down strays. In campus life, Wen Shengsheng met the mysterious boy Jian Xun, while Yin Yi developed feelings for the human girl Ge Ying. Mission accidents occur frequently. Yin Yi activates the space crack to evacuate to save Ge Ying, leaving Wen Shengsheng to face the crisis alone. Fortunately, the man in black rescues her. After returning to the Styx System, the two were punished, and Ge Ying's memory was erased and sent back to Earth. After the docking period ended, Wen Shengsheng returned to work early, and went to the Bomian galaxy with Yin Yi and Bei Weiwei to perform a mission and met the domain lord Milos. Secor's surprise attack awakens the guardian bloodline in Wen Shengsheng's body and repels the enemy. On the way back, they encountered a disaster of light flow, and a hundred years passed by. Wen Shengsheng returned to Earth despite the ban and found that the Earth had entered a new era of integration of high technology and biology in a hundred years. Jian Xun became the Lord of the Earth Territory, but pretended to have amnesia. The truth gradually emerges: Jian Xun is the last star master of the Xingshu clan and is forced to protect the earth; Yu Lan, the mother of Wen Shengsheng, is also a guardian and disappeared while researching to break the curse. After the two reunited, their relationship heated up. Jian Xun officially announced their relationship and prepared for an interstellar alliance. However, Secor led his army to attack. In order to protect Wen Shengsheng, Jian Xun imprisoned her and wanted to send her back to the Styx System. Wen Shengsheng broke free and rushed to the battlefield. She witnessed Jian being eroded and mutated by dark energy in order to save her, and finally blew up the crystal core in order not to hurt her. Wen Shengsheng refused to accept the death of her lover, and took Jian Xun's body to the Eternal Corridor Galaxy to seek treatment. After the rescue failed, she took him back to the Styx System, used a temporary crystal core to extend his life, and guarded him day and night. After nine months of perseverance, Jian Xun regained her life, opened her eyes, and called out her name again.
Intention: the end