The brighter the city looks during the day, the darker and dirtier it becomes at night. The darkness of the city is not entirely due to poverty, but more to people's desires. The human heart is deeper and more stinking than the city's sewage canals. Everyone is another person in secret, and everyone has repressed desires and dark sides in their hearts, but in reality they have never been able to vent, and can only silently endure, living like zombies with their heads down, until one day, when they connect to another world and see the dark and smelly side of this world, their lives will never go back...