The night she was laid off, Lin Wan found an app on her phone that she couldn't delete. Accept a job and work in the deepest hours of the city's night. Survive, and the reward is paid out on the spot. Late-night office buildings, the last subway, shared apartments, delivery hubs... Every corner with a light on has a set of rules posted there. For everyone else, going in means certain death. For her, it means easy money, because she can see the notes written in blood by those who came before, right beside the rules. Until one day, she realizes the handwriting in those notes is exactly the same as her older brother's, who disappeared three years ago.
