Responses
I don't know if you read the latest chapters (I'm at c149) so I'll put a spoiler warning
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SPOILER
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Basically System created a fake world to put the soul of people it harvested/killed in. An illusory utopia, if you will. And the 1st things it does is erase bad memories and creat some happy ones to make people adapte to this perfect World without pain, death, etc...
It just did it, coz y not. Hate the system but also confused wen it ran away it went to the people that she killed and there were like they were happy like it was just a misunderstanding.
Actually I'm confused about the system motive and the general monster that were said to be placed in every planet.