I read a few chapters, but I stopped reading because the mc's personality really doesn't suit me. Because he was a demon in his previous life and now a wizard, I thought he would have a cold and selfish personality, but his personality doesn't match his experience, really strange.. in the end it's not a 100% bad book, but no try to compare with WMW, they are totally different levels.(I used a translator, so I don't know if it's right)
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LIKEYou should read a bit more, he is still like a demon but he is too weak to do much at first but later on he does in fact inflict eternal suffering on others and those who wronged him, generally going from him simply erasing their existence from the universe with no way to come back to constantly draining his enemies of of all their blood and then regenerating it in a endless cycle to gain more power.