At 2:30 AM, the dormitory building encounters a bizarre crisis, and his roommate falls into grave danger. Cheng Ye awakens the talent of premonition dreams, which can realize time backtracking while retaining his status. He must fight his way through the entire dorm building before 4:00 AM, or his consciousness will be permanently trapped in a different dimension. Here, the environment alternates every thirty minutes, and danger lurks among the crowd. Clues for help from three years in the future uncover the secret of the monsters' mutation. Cheng Ye enhances his strength through one perilous trial after another, joining forces with survivors to make a desperate breakthrough, until at last he discovers that behind this crisis lies a mastermind force far more dangerous than the monsters.