Shen Yan is an outsourced temporary night-shift worker at the Folk Customs Archive. After completing his three-year probation, he can become a permanent employee and enjoy a paid retirement from the Underworld. But on the final night before his promotion, the 404th and last train on the Yin Road makes a bizarre, unexpected appearance, and a rules-based supernatural scenario descends! Faced with a passenger code that guarantees death and a red-clad female ghost out to claim his life, Shen Yan calmly pulls out the Underworld Attendance and Performance Log. Stopping a living-world subway without authorization? Setting up a ghost-wall toll scheme? And now you've cost this judge his perfect-attendance bonus and put his probation at risk of being reset? "Hands on your head, face the wall, and stand at attention! Your accumulated virtue performance score for the second half of the year has been docked to zero!" Thirty years ago, a great upheaval struck the Underworld. The Ten Yama Kings vanished, and supernatural tales ran rampant in the human world. See how Shen Yan, armed with the official master ledger of the Bureau of Merit Assessment, turns the tables in these rules-based supernatural scenarios, cleans up crooked operations, enforces attendance and audits by the book, and restores order between yin and yang!
I'll shut up first so as not to spoil the story as soon as I open my mouth.