Before the armillary sphere in the Forbidden City's underground vault, Lin Shutong held the last letter, shimmering with starlight. It contained only an equation written in superfluid helium, a theorem by which Fu Shiyan proved his existence across all of spacetime:
"When the probability wave function of love collapses, all our selves across parallel universes will reunite."
This life-and-death romance, a struggle against time, will find an eternal solution beyond the speed of light before the wormhole closes.
