The female protagonist is a killer. She struggles between justice and evil at first, but later develops fixed values. She will have sex with many people but is single-minded in her heart. The male protagonist becomes loyal to the dog, becomes a black man after being abused, and returns for revenge. The two men and two women are also psychologically abnormal but have charming personalities. It's neither a noob nor a Mary Sue. It's bloody, violent and dark, so I don't like to get into it by mistake. BE is very possible, but there will be sugar in the middle.