Due to a high-paying night watch job, Lin Yan entered a private old bookstore that had been dusty for hundreds of years. There were countless unclaimed "memory books" in the bookstore (each book corresponds to the unfinished obsession of a deceased person). The night watchman must strictly abide by the 12 rules posted on the back of the door. Once violated, he will be "entangled" by the obsessions in the books, gradually forget his own memory, and eventually become a new "unowned book" in the bookstore.
