Calculate a Starry Sky for You

AI expert Su Wan's marriage app matched her with Lu Shen, the architect upstairs, as a "soul mate", with a compatibility as high as 99.7%. She sees it as a bug in the algorithm, he sees it as an echo of a years-long crush. When the rational code collided with his silent love letter written in architecture, she realized that the most sophisticated algorithm could not account for the 1% of accidents called "heartbeat".