Now I'm sure it's Duke that killed all these people... Coz he loved the mc and all the dead people have same characteristics as mc( short black hair,white skin) and becoz he couldn't get close to the mc ,he search for his substitute... 
Comment by Rose_Avacado on Who's Your Daddy? - Chapter 26
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@Rose_Avacado and also that night Duke gave that drug to mc and was going to sleep with him... so that's why mc couldn't remember anything