Review Detail of Zenema in Death with benefits

I really love the "you get stronger when you die" part, but God this novel is awful. As far as I read I saw that it's going the harem route so... there's gonna be no story progression whatsoever. Well now about characters. MC is bland, extremely boring. He's supposed to have extremely high intelligence (as of now about 200-300x normal human) but he's acting like a stupid child with autism. The other characters don't really have any personality. The vampire girls father doesn't like her dating the mc (he's supposed to be insanely strong and old) so he kills him 1 time and the girl says he's immortal so the father lets him date her? Well the world is crap. The supernatural lived in the city thousands of years and not a single normal human saw anything. Well overall it's just trash