In 2149, the immersive code universe "Starry Sky" became popular all over the world. It uses quantum-level code to build a virtual world that is highly synchronized with reality. Humans can access the device "Star Core" through consciousness, and experience the ultimate real starry sky roaming and civilization exploration. Lin Che is the core development engineer of "Starry Sky". She is introverted and lonely. Her only obsession is to find her sister Lin Yue, who mysteriously disappeared during the testing phase of "Starry Sky" three years ago. For three years, he stayed in the development team anonymously, secretly investigating code loopholes in "Starry Sky" and trying to find clues to his sister's disappearance. While optimizing the core star map code of "Starry Sky" late at night, he accidentally triggered an unknown encryption program. The virtual starry sky in front of him suddenly distorted, and strange star trails that did not belong to the setting appeared. What's even weirder is that the code logic of this star track is highly consistent with the first piece of code that his sister taught him to write when he was a child. With further investigation, Lin Che discovered that "Starry Sky" is not a simple virtual entertainment product. Its underlying code hides the possibility of building a parallel world, and her sister's disappearance may be related to this code. He began to shuttle repeatedly between reality and the "starry sky", avoiding the pursuit of the development team while decoding the secrets of mysterious star trails, but unexpectedly attracted the dark forces that coveted the technology of the parallel world. In this game between code and reality, Lin Che not only has to uncover the truth about her sister's disappearance, but also protects the "starry sky" from being used maliciously, and finds her own salvation and mission in the bright starry sky woven by the code.