Twenty-six-year-old librarian Chen Mo found himself trapped in a strange seven-day cycle after suffering a cardiac arrest. Every Sunday at midnight, he wakes up in a mysterious library called "Forgotten River" and is forced to participate in a survival game controlled by "gods".
The rules of the game are cruel and absurd: within seven days, Chen Mo must find and seal a target named "Inner Demon" from the bizarre "other world". If he succeeds, he will receive the "reward" of returning to reality for one day and become stronger; if he fails, or dies in the game, all traces of his real existence will be completely erased.
What is even more desperate is that Chen Mo discovered that the reason why he was selected seemed to be related to his long-lost father who was once known as the "Last Night Watchman." And this library, which is constantly changing its rules, seems to hide the ultimate secret that subverts the entire game.
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In the loop, he got acquainted with the girl "Liu Li" whose identity is a mystery, and the strong man "Taishan" who is both enemy and friend. They are both allies and competitors, struggling to move forward amid cooperation and suspicion. Chen Mo must use his unexpected special ability "Eye of Retrospection" to uncover the truth of the game within a limited period of seven days, find the mystery of his father's disappearance, and break this cycle of despair
