Destined first encounter: Gu Qinghuan, a student from the Department of Archeology, touched an ancient hairpin and traveled through time in a museum. He encountered a mysterious woman bathing scene and accidentally activated the time-traveling ability of the Star Sand Pendant.
- **Mystery of Identity**: It is discovered that the national master Yunxiu has the same appearance as himself, and the two are involved in the secrets of the palace twenty years ago, uncovering the cruel truth about the sacrifice of twin sisters.
- **Star Trajectory Bond**: Yunxiu observes the stars every night to find a way to break the deadlock. Gu Qinghuan gradually awakens the memory of his past life in the cycle and discovers that the two of them were originally the star trail twins who guarded time and space.
- **Blood Sacrifice**: In order to prevent the Imperial Master from using his twins to sacrifice his twins to restart time and space, Yun Xiu chose to sacrifice himself, while Gu Qinghuan searched for a way to achieve both ends in the time loop.
- **Star Sand Eternity**: In the end, the two people's blood merged in the star array, and the pendant turned into a galaxy to reshape time and space, opening a new cycle of encounters in a parallel world.
Intention: Be casual