Yao Guang, the youngest star fairy in the heaven, was demoted to earth for violating the rules of heaven and lost her memory, leaving only a star glass that can awaken the original power. In the mortal world, she meets the cursed boy Mo Chi in a border town. The two embark on a journey to find the truth together because of the same loneliness and foreign identity. However, Yaoguang gradually discovered that Mo Chi's curse was actually bound by a forbidden spell from heaven, and her descent to earth was not as simple as punishment - the fate of the two of them had already been drawn by an ancient will outside of destiny. Yaoguang longs to regain his memory, but during the adventure he experiences the intensity and beauty of human emotions, which shakes his belief in returning to heaven. The secrets hidden in the star glass and the power struggle between the heaven and the mortal world make the love between Yao Guang and Mo Chi difficult at every step. In the end, how will she make a choice: follow her destiny, or go against destiny and change her destiny to protect her forbidden love? In a world where fantasy and reality intertwine, Yao Guang's story flows like starlight, igniting the cracks in destiny and hope.