Sci-fi writer Yu Bufan accidentally transmigrates into his own creation, the Deep Blue Planet, turning into the superpower guard Pegasus Captain to investigate the Dream Star people's dream-stealing invasion cases. He and the Dream Star woman Yue Hu go from bitter arch-rivals to awakening a past-life love transcending races; partner Hao Qi and the maiden Li Na sprout cross-species affections. On the night of the Seven Stars Alignment, the villain Miele Lan turns traitor and faithless, and Yue Hu bears the Pure Yang power with her body to seal the villain but loses control. Yu Bufan makes a tragic choice between the greater good of all living beings and his beloved, personally ending his beloved before returning to reality.