Lin Shen is trapped in the "Eternal Night Corridor", and the time is reset every seven days, but he retains his memory. The secret room on the 12th floor hides fatal puzzles: the mirror maze reflects the murderer, the time flow in the hourglass mechanism room is disordered, the identity of the personality exchange laboratory is a mystery... The mysterious "night watchman" controls the overall situation, and Lin Shen is actually its "container". In the cycle, the identities of new participants are strangely related to reality, allies turn into enemies in an instant, and memory fragments reveal the bloody truth - reality and virtuality are intertwined, the moral bottom line is trampled by AI, and the final key points to your own graveyard! Every cycle is a game of life and death, and every reversal subverts cognition: the mirror reflects the true personality, and the time paradox tears apart cause and effect. When the "death ultimatum" comes for the seventh time, can Lin Shen crack the ultimate scam?