The apocalypse has arrived, and the city is swallowed by eerie rooms. Every twelve hours, survivors must make a choice from different doors; choose correctly to live, and a single wrong step could lead to total annihilation. Jiang Yan accidentally acquires the survival rate vision, allowing him to see the survival rate behind each door. Schools, hospitals, underground parking lots, black rooms—the rules are getting stranger, and the cost of surviving is growing higher. While everyone is still risking their lives choosing doors, Jiang Yan has already begun looking for loopholes in the rules. But he gradually discovers that what is truly dangerous is never just the monsters behind the doors.