Psychological experiment subject Lu Chen and Su Xiao, who enters the game to find her sister's experimental archives, successively break into simulated scenes such as a supermarket, an abandoned hospital, a doomsday subway, a high school teaching building, and an underground shelter. Amid rules, violation judgments, and system defenses, they gradually uncover the truth of the old experiment, and finally enter the main control server room to terminate the infinite loop. Lu Chen also confronts the guilt memories blocked by the system.