The actual cause

15years early before End

In a house of Nepal , Kathmandu looking outside at the rainy sky a person is trying to die in his own bead by resisting his own breath

' today I will die or humanity will die'

'either it is me who goes extinct '

'or it is the humanity that will be fucked by me'

This person is non other than purak this is the person who brought end this was the person who was crushed by society , drowned by cruel society and build by society to such extend that he became the cause of death of humanity.( A different story for purak in his own book the birth of cursed baby)

That night he survived and became the end of all humans

After studying for 10 years purak had made a virus InfectoD the virus that infects people but helps people increase their memory

Purak was awarded as a great virologist the one born in the in century and he was the best after most of the people had injected this virus purak earned billions of dollars. Well it was given to him by his company to create a lad to create more of this kind of virus and then he beganed his plan to exterminate all humans he created a virus called Z virus on the surface it would eat viruses that infect a body but it's real work to evolve into new virus by consuming one kind of virus but it needed long time at most 2 years was needed .

This virus was choosed by purak because it evolved by consuming infectoD into Zombies virus