The Old Abandoned City: Awakening of the SSS-Level Nightmare at the Beginning

One day, all humans around the world will be forcibly pulled into a shared dream world called [Old Abandoned City] at midnight. This is a nightmare dimension full of deformed monsters and ruined walls. If you die in your dream, your body will die simultaneously in reality. As time goes by, the border between the two worlds will become thinner and eventually merge completely, bringing the nightmare into reality.